I am so sorry to be this guy, but did she tried CBT with a trained professionnal? You should allow her to vet the therapists (some are bad, other are worse, but good ones definitely exist).
I'm not in the "you should seek help" camp, at all, but for eating disorders in particular, randomized trials show that CBT is extremely effective, on the short and long term.
She was seeing a psychologist in the few weeks prior to her hospitalisation and my wife tells me that CBT was part of that.
Post hospital discharge, hopefully in a couple of weeks, we'll be doing FBT (family based therapy, I think) which, according to this morning's information session, is rated above CBT in it's effectiveness.
There's a 12-month-ish program she'll be going into once she's recovered to a healthy weight / nutrition level.
I'm not in the "you should seek help" camp, at all, but for eating disorders in particular, randomized trials show that CBT is extremely effective, on the short and long term.