Anorexia is a very tough thing to deal with. It affects all sorts of girls, and is hard to treat.
You're not to blame, but you can do a lot to help. The most difficult thing is getting the person to recognize that they are in trouble. It sounds like your daughter already recognizes that.
The next step is to get her to a professional who treats this disorder. You can't do it yourself. A combination of medications and therapy can do wonders, as long as the person with the disorder wants to be helped. Spiritual help can also be a big boost, if your daughter has religious beliefs.
Your role will be a supportive one.
I know two families who have anorexic daughters. They're both working very hard with their daughters to get through this.
Please have strength in dealing with this, and take whatever help you can find. Love your daughter and support her in her recovery. But...you cannot fix this alone.
My thoughts will be with you.
Some anti-depressants can help. I would contact your family doctor, go in and see him or her together with your wife, and have the doctor help come up with a plan.
God bless you...prayers!
Thank you, so much.