1) Read these two books on OCD - The Boy Who Couldn't Stop Washing by Rappaport, and Brainlock by Schwarz. Eating disorders are on the same spectrum as OCD and reading these books will help you understand better what you are up against.
2) Nutrition, nutrition, nutrition - in order to heal her brain, you'll have to get proper nutrients back into it. Try contacting the Institute for Functional Medicine to see if they have any practitioners in your area who have experience with eating disorders. A good quality multivitamin with extra B vitamins and 2 capsules of fish oil and 2,000 IU vitamin D at a minimum.
3) Read about lowdosenaltrexone dot org. I do not have experience with it in OCD but has been helpful in some other autoimmune disorders.
4) If your daughter is on anti-depressants, you need to hand them to her every day and see her swallow them. My daughter would get WHACK if she missed a day or two - despite the doctors insisting the half-life was too long for that to happen - and I'm convinced the reason for increased suicides in adolescents on these drugs is because of their inconsistency in taking them.
5) Get your daughter checked thoroughly for strep antibodies, thyroid antibodies, celiac disease, and any other disorders which might run in your family.