F.G.
You could also take her to a nutritionalist and have a counseling session with one of them. If she understands what she is doing to her body by benging and skipping meals, then she may be less likely to do that. Also, the nutritionalist could teach about eating organically and the right portions for her body weight. If I had had that kind of advice when I was 14 it would have made a world of difference.