Call your daughters Doctor and ask him/her to refer you to a counselor/ psychiatrist/ psychologist who specializes in children with eating disorders.  This was the only way we could help our son.  Unfortunatly there are not many Specialists in the yellow pages (we looked) that will or are trained to deal with children.  It has really helped put things into perspective for us and helped us with counseling for the whole family as well as our son.  We are all working on staying healthy and "lost" our bathroom scale three years ago and counting!  My prayers are with you and your daughter and try not to stress to much about the problem, from my experience it only makes things worse and makes you feel like a horrible person.  Hope this is helpful. :)