Another 5'4" woman here with a lean body mass of about 120 lbs! I could never be 125 without sacrificing a lot of precious muscle. I also know other woman my height for which 125 would be heavy. It really, really varies by individual.

I'm currently at about 151 and heading down to the 130's (from a start at 175). I was doing my own 'healthy eating' diet and it worked for awhile. Then I got kind of uninspired and I lost interest in being diligent enough to lose weight. I joined WW 3 weeks ago and it's been really good for me. I've tried their other 'points' plans with no success, but this newest version is great. It's easy, it's a great way to keep track, and it's working. I'm down 5.2 lbs, I've got all the energy I need for my workouts and I'm not suffering at all.