Trying to understand weight loss rate

You may not be eating enough to properly fuel your body so it could burn the pounds away. You workout 6 days a week but your food seems a little on the low end. My suggestion is to set up your profile in MFP and start tracking as accurately as possible (food, exercise, water, and measurements). Only then you'll be able to spot problems that are affecting your weight loss. You body may also be retaining water as well.

Just to clarify, are you netting 1500 calories? I'm 5'6, also netting 1500, and losing (slowly but surely), but starting at 145, so I have even less to lose but still its enough food to be losing at my weight. I eat anywhere between 1800-2200, usually hovering around 1500-1700 net after my workouts. If you're eating a total of 1500 calories and then on top of that working out 6 days a week, then I'd say you're definitely eating to little and you may want to try reverse dieting. That would probably net you less than 1200 calories, the recommended intake for a 6 year old! (BTW, don't listen the MFP recommendations, you're right to not go by the 1300!)

If not though, and you're counting the exercise calories burned into the 1500, maybe check the source of your food. Try eating simpler foods with fewer ingredients because too many chemicals, pesticides, and fillers can make your metabolism go awry. Sort of already sounds like you are, so in that case then make sure you start logging everything, perhaps there's a weak point somewhere in there!

One more thought -- are you drinking enough water? (2-3 liters/day?) Dehydration is the biggest factor that can cause a slow metabolism.

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I dont' really use the diary here, so I'm going to give a sample of my average day

You don't use the diary. That's probably half the problem here.
Weigh your food. Log it consistently everyday.
Chances are, you're eating more than you think if you're 1) Not weighing your food and 2) Not logging. How do you *really* know you're eating 1500 calories if you're not accurately logging? At best 1500 is just a guess until you exercise some consistency.

I'm not using the diary, but I am logging everything. I maintain a spreadsheet every day, where I have a list of all my foods, how much they weighed/measured, and I have done the research on the database here for the calories/fat/carbs/etc. Trust me, this is not a logging/measurement problem. I keep account of *everything*, even those days when I go over or ate out (I look up the nutritional info online).

Then based on your activity level, I would suggest increasing your calories. You probably have a calorie deficit that is too aggressive. At 1500 calories, and doing some pretty good exercise based on what you listed, you're probably barely netting 1200 calories, if at all. But 1200 NET, if you are getting that, isn't appropriate for your height and weight.

If possible try to figure out what you are Netting (1500-Exercise). That should give you a ballpark at where you are at. If it's around 1200 calories, you should increase your calories.
You can also use something like Scooby's calculator:
http://scoobysworkshop.com/accurate-calorie-calculator/

This will give you how many calories your should be eating with your exercise factored in. Be honest with how much you're working out. I put your stats in and it gave me nearly 1800 calories to lose weight with moderate exercise. That's a pretty big difference from your 1500.

So yeah, really consider your calorie deficit. Try doing 1800ish for 4-6 weeks and see how things pan out and re-*kitten* if you're not losing at the rate you're supposed to with that.

edited for spelling :P

Just to clarify, are you netting 1500 calories? I'm 5'6, also netting 1500, and losing (slowly but surely), but starting at 145, so I have even less to lose but still its enough food to be losing at my weight. I eat anywhere between 1800-2200, usually hovering around 1500-1700 net after my workouts. If you're eating a total of 1500 calories and then on top of that working out 6 days a week, then I'd say you're definitely eating to little and you may want to try reverse dieting. That would probably net you less than 1200 calories, the recommended intake for a 6 year old! (BTW, don't listen the MFP recommendations, you're right to not go by the 1300!)

If not though, and you're counting the exercise calories burned into the 1500, maybe check the source of your food. Try eating simpler foods with fewer ingredients because too many chemicals, pesticides, and fillers can make your metabolism go awry. Sort of already sounds like you are, so in that case then make sure you start logging everything, perhaps there's a weak point somewhere in there!

One more thought -- are you drinking enough water? (2-3 liters/day?) Dehydration is the biggest factor that can cause a slow metabolism.

MFP sets net calories and expects you to eat back exercise calories. It isn't wrong, so "don't listen [to] the MFP recommendations" is an uninformed suggestion.

you're only eating back 200 calories regardless of how many cals you burn? that may be where you need to make adjustments.
i know i burn about 300 cals during about 30 minutes of walking, so eating back 200 calories might be appropriate for me, but from what you've listed you're doing a lot more than 30 minutes of walking.

I also prefer to use the my TDEE numbers. This link helped me calculate them and I calculated them for light activity (my lazy days) and very active (I will often workout 3 times a day).

http://www.myfitnesspal.com/topics/show/912920-in-place-of-a-road-map-3-2013

Good luck .

Calories:
I am eating a total of 1500. I have thought about the possibility that I'm eating too little, but I am so scared of increasing that and gaining weight, since it's taken soooo long to lose it. I don't know how to distinguish between a- this is just my body, it just goes slow; b- eating too little so it's struggling

Water:
I'm making an effort to drink at least 80 ounces of water a day, and have been doing it for months.

Weight/measurements:
I measured my body fat % (skinfold test) on December and in March, and it went down almost 2% (currently around 27.7%). My measurements have changed and my arms/legs are looking different. My waist got down 2 inches at the beginning, but honestly has not changed that much over the last few months. So I'm definitely looking/feeling different but don't see that much change on the scale. That's why I wonder if I was eating too little, would I be seeing this weight loss? Or is it possible to see a slow weight loss and then, when calories get increased, see a faster progress?
I also recognize that I'm doing weights, so that may be part of it...but then, how do people lose the weight even with strength training? I honestly just don't want to be in the 150s anymore :S

Who did your skin fold testing? You mention that "I measured my body fat". Since one of the skin fold sites is the triceps area, it's anatomically impossible for a woman to accurately measure herself.

If the trainer did it, and we assume it's reasonably accurate, then you have an estimated lean mass of 113 lbs, which is higher than average for your height. That just means that your target weight at any given body fat % is going to be higher than average as well.

I am very skeptical in general of the "eating too little argument" in general, but especially when someone is eating 1500 calories a day. It's not impossible and it doesn't hurt to occasionally take "diet breaks" where you eat at maintenance for a few days to kind of "reset" your hormones, but it's used too often as a convenient excuse.

Even though you are working out 6 days per week, I'm not sure you are doing as much exercise as you think. If you are lifting weights, then your trainer sessions are not generating a huge burn. If you are doing "fat burn" level cardio, you are likely in the 350-400 calories per hour on those days (you don't mention the duration of those workouts, but if they are shorter than 60 min of paced intensity,then total burn for those sessions is not huge). You also mention doing classes which tend to consist of intermittent activity and often don't burn as much as people think. It's possible that your total exercise calorie burn per week is around 1500, which is enough to see steady progress, but the progress will be slower.

It also looks like your eating plan is unbalanced. 45% protein is like 170 g of protein per day. 100 is plenty. Your plan also seems devoid of any vegetables or healthy grains, and it sounds like a lot of processed meats.

To put things in perspective, you are losing steadily, so technically nothing you are doing is "wrong". There are some ways to improve the overall balance of your exercise and eating plan, if you want to try some new things.