I would also consider giving her some reading that looks at cultural ideals of beauty and attitudes towards the body. Naomi Wolf's The Beauty Myth is a classic. Our Bodies, Ourselves is also a good one. I think it's so very important for girls and young women to develop a positive, loving, grateful relationship with their bodies, no matter what they look like, and that if they appreciate their bodies, they will nourish themselves well.
If you want something less controversial, what about some food reading like Michael Pollan's The Omnivore's Dilemma or Barbara Kingsolver's book, Animal, Vegetable, Miracle?
I second these suggestions. especially if she is searching.... they are great resources for nutrition, how people eat, why people eat. etc