Hi. I am sorry. I know how painful and horrible this can be. Are you both by chance in school? If so, you could perhaps contact a guidence counselor. Do you know if she has family members who have tried to help? And if so, do you know what they have tried? What she has tried?

In my opinion, you could try to get a group of her friends together and surround her with huge amounts of love. and see if she is willing to allow professional help. Love love love is often really important.

I wish there was a solid answer to give you. I do believe that people here will continue to support you while you try to help her. also if you want you could call or email the national eating disorders association. Talk with them and see what they might recommend.