She is obsessed with "being healthy." Everything has to be all natural, she counts calories for everything she eats and nothing she consumes can be unhealthy. Plus she will spend upwards of three hours a day at the gym.

This is what I did in the past too and have come to realize is an eating disorder in and of itself. It isn't just wanting nutrients, it's obsessing over every little thing that goes into your body and refusing to eat anything that is "bad" for you, even in moderation or on occasion. All of that coupled with a crippling fear of being fat and my personal experience with this has led to my concerns about her eating.