Number 2 and 3 are in your hands, parents!
Dr. O'Toole at Kartini describes it just right, and cites some Australian research which backs it up:
What Helps Children
"three factors determine outcome in children with anorexia nervosa:
I'd add to this that you need to have a treatment team that believes parents should step up and be in charge of feeding, and works to strengthen #2 & #3 and not work against them. The truth is that the great majority of treatment available to families does neither.