People who have eating disorders tend to deny it and work very hard to hide their problem from people who would help them. It goes along with the territory, but it is very dangerous. Can you talk to her parents or someone who can get her into treatment? And then, encourage her to accept help (treatment), and let her know that you care about her and accept her for who she is. People do die from eating disorders, so it isn't something to take lightly, however, just coming out and confronting her with it might just push her into trying harder to hide it. It's so important to be supportive. Not an easy situation.

<font color=orange>"If we are going to insist that people pull themselves up by their own bootstraps, we must ensure that they have boots."</font color=orange>