The thing is, even if you (or I) had known sooner, there is nothing anyone can do about it until the person with the ED is willing to say they have a problem and get some help for it. You have done all you can possibly do under such circumstances.
As I've said before, we're pretty sure DD has had some aspect of this, the beginnings of the MH/hypothalmus problem since birth, and puberty has been the trigger of her sh and ED.
This is from our last family session:
Psych: so how long have you been having suicidal thoughts, MissYego?
DD: for as long as I can remember
Psych: so...before the ED then?
DD: Yes, before the ED, for a long time before...
ME: You mean, even in primary school?
DD: yes
Me: Even where we used to live (infant school)?
DD: yes. (To me) Don't you remember that time when I was about 6, I was sitting on your lap (at our old house) and I asked you something to do with ending life/suicide (can't remember exact words) and you pushed me off your lap and told me never to talk about that kind of thing ever again!?
Me: (crying) but...I was depressed then and having counselling, I thought you had overheard something or were copying me or something like that. My counsellor told me you couldn't be depressed and I believed her! I was trying to protect you from my depression.
...
It doesn't make it my fault any more than it is her fault. would it be my fault if she had cancer, or a heart defect? So equally your daughter's illness cannot be your fault. People with eating disorders hide it. The school didn't flag it up, and they see her beside her peers on a daily basis. Parents are the last to spot these things as we love unconditionally.