I may be misreading what you're saying, but I think that is a huge problem. Her body type is her body type. There is no *should* involved. I think labelling it as wrong and trying to change it will not only fail, but cause unnecessary pain, perhaps lasting body image problems. Carrying more weight in one's lower body is a very common, feminine body type, and is generally considered more healthful than carrying it in the middle.

I think the fact that this body type developed when you changed her diet may be coincidental, given her age - she's at the age where those features develop. If anything, perhaps better nutrition just allowed her body to do what it was meant to do, rather than causing her shape to change.

I empathize with trying to help a teenage girl with food and body image, I really do. It's tough in this day and age.