Why isn't this working?

2lbs a week loss is not aggressive for someone around 160lbs.

Yes it is, especially since her ticker says she wants to lose only about 25 pounds more.

It isn't if you're doing it healthily. I averaged around 2lbs a week until the last 7lbs and it has stayed off. I've also lost over 100lbs.

Think what people are trying to get at for the food scales is, even where you are using a tablespoon of mayo (for example), weigh it and use that as your calorie measurement rather than the tablespoon calorie measurement, you could take 3 different tablespoons of mayo and they would all be different weights and therefore different calories.
Personally I don't think you're eating enough (remember that even eating boosts your metabolism to burn calories), I have a fairly sedentary office job, but I walk over 5k a day between walking to the train station and then to work and go out for a walk at lunchtime, I also run 4 times a week, PT & weights once a week, on my rest day I eat approx. 1800 calories, on an exercise day I eat 2000 and lose 2lb a week, I screwed up about 3 weeks ago and was logging approx. 200 more calories than I was eating (so in effect I was only eating 1600 on my rest day and 1800 on my exercise day), I gained 2lb a week until I noticed my error (I had taken 2 porridge pots on the morning I done the marathon to fuel me through that and then forgot to put it back to one portion after)!!

While the calories in/out is the factor, for some people, especially us shorties who need a lot less calories to maintain, exercise can be a very important tool. Especially in seeing results fast enough to not be discouraged.

And since 1200 calories is the minimum recommended to get enough nutrition (i agree), we do not get enough calorie deficit per week from cutting calories alone. I have used different formulas, and if I eat 1200 calories a day, my deficit is 2800 a week, less than 1 lbs per week. Yes, slow weight loss is good, but it can feel frustrating. So adding exercise and not eating back all calories can help boost the weight loss to a level where one can feel happy about it, plus the wonderful "side" effects of exercise are great! :happy:

Exactly. I'm 5'2. Aside from that I just love encouraging people to exercise. I was involved, as a female marathoner, in the schools helping promote the nike campaign "if you let me play sports...". It keeps girls out of trouble, getting pregnant before they are ready, have higher self-esteem, you name it. When I went from 188 down to 138 from sedentary to 20 percent body fat and running marathons the jump in my esteem was palpable. I'll never forget when I finished new York city marathon (my first) and the lady put a finishers medal around my neck. I cried like a baby and kissed that medal. She asked me why I was crying. I said " I'm crying because I'm happy.". It was everything.

2lbs a week loss is not aggressive for someone around 160lbs.

Yes it is, especially since her ticker says she wants to lose only about 25 pounds more.

It isn't if you're doing it healthily. I averaged around 2lbs a week until the last 7lbs and it has stayed off. I've also lost over 100lbs.

It's too aggressive because it's generally not sustainable in the long run. You must be the exception to the rule that people who lose weight too fast generally don't keep it off.

Congratulations on your weight loss.

How long have you been stalled this second time? If you started by losing 2 lbs a week for a couple of weeks and it's only been another couple of weeks, then that's normal and no reason to think something's wrong. At your height and weight, even at 1200, it's extremely unlikely that you will lose 2 lbs/week without increasing exercise or daily activity, so it might just be the averaging out or monthly fluctuations. (Like I just lost over 2 lbs the last couple of weeks, who knows why, and will be lucky to be down a lb this week on my weigh-in day tomorrow, while doing nothing different.)

I might be wrong, depending on your activity level (I'm assuming you said sedentary, but need to double check) and since you are younger than me (I'm 5'3 and 170, which is a similar height/weight combination), but I ran the numbers quickly on a calculator and suspect this is so. Look at your goals and see what MFP claims you will actually lose at the current goal. One option if you haven't been stalled for long is just to be consistent with the logging if you feel good and energetic, and expect an average more like whatever MFP says. (If I'm wrong in my guesses here, you can ignore this, of course.)