what a toughie. if it is because she wants to stay thin stress to her that taking her meds and eating right wont make her become fat and that she needs enough nutrition to grow tall enough to be a model. models dont get too far if they are short. she still has a couple of years of growing left so if she blows it now its over. deathly thin models dont make it far either. people can be thin enough to model and still be healthy, they just need to draw the line somewhere.