You might want to change your body split if you are lifting every day. You will use your biceps during back day, so the following day you should be resting your arms, not working them.

I like the following:
Day 1-Upper pushing (chest, triceps, front and top of shoulders)
Day 2-Upper Pulling (back, biceps, back of shoulders)
Day 3-Lower Body (low back, legs, gluts)
Day 1
Day 2
(Day 3- Saturday- so only do occasionally and legs are done daily with cardio, so missing the second day of low body is not as much of an issue for me. As a woman, my lower body develops much faster than my upper body).

Abs can be done a little each day.
When doing cardio, I prefer to lift first and do cardio last.
Take a shower right after you work out and eat something healthy.

This will give you two days to recover the muscles worked.

You could also try fewer reps in order to increase the weights.
However, the longer you lift, the slower progress you will make as far as increasing the weight you can lift.
This is to be expected.

Try not to spend more than an hour total for your workout. I used to do an hour of lifting and an hour of cardio, but it stresses your body and prevents growth.

Also, a HUGE part of making progress is the food you eat and the rest you get. Make sure you are eating enough proteins and other vital nutrients your body needs to recover and stay healthy. Make sure you are getting at least 8 hours of sleep per night.

Give yourself at least one day of rest. If you want to go to the gym, just volunteer to wipe machines or something.

p.s. When I did this consistently, I weighed 115 pounds with at least 90 pounds of lean body mass at 5 feet 1 inch tall. Now, after many years of eating poorly and two pregnancies, and not working out for years at a time, I have gained almost 80 pounds.

I do hope by doing what works for me, I will be able to get back to at least 125 pounds with about 100 pounds of lean. Right now I am more than 100 pounds of lean body mass, but 86 pounds of fat...

Good luck!

You're going to have to do some research on how resting is one of the most important things for building muscle. Proper recovery is extremely important and you're not really doing that.

Can you point me in the direction of any good articles/research? I would love to learn more.

http://www.timinvermont.com/fitness/fund.htm

You should start thinking about your programming more and how hard you are working in each workout to maximize your goals. If you are going to the gym every day and lolly gagging around, you are not working hard. If you are going to the gym every day and giving your best, you should be incredibly sore and unable to perform with good form/technique if you returned the next day. You should be performing your hardest and then allowing your body to recover.

Lifting weights is the tearing of your muscles... breaking them down. We use recovery and feeding our body properly to build back the muscle plus some. This is the process of toning up and building muscle in general. Recovery is VERY important.