Sorry to hear about your daughter, {{{{Ellie}}}}. She is going to need a lot of love and support from you two, but I am confident in your ability to rise to any challenge...
I am sure you already have researched the literature on ED and have lined up all the guns... It's the nature of the beast... but I happened to remember an old thread of Berto's you may want to check out. His W has an ED, as does mike101's. Here is the link. Of course there are a few issues of a 'marital' nature that you'll have to skip, but quite a few people post about their experience, first or second hand, with ED.
Also, and I hate to ask, has your D had any 'bad' experience in school involving boys?
"You don't throw a whole life away just 'cause it's banged up a little"
Tom Smith in "Seabiscuit"