I had anorexia in my late teens/early 20s.
I was sent to the local psychiatric outpatient clinic where the focus was all on food and making us eat it, I found it utterly useless and if anything it made me worse.
Luckily a friend of a friends sister had been through the same thing so she gave us the name of a behavioural psychologist who hardly ever mentioned food and helped me sort out the root cause and then the eating fell into place by itself.
IME eating disorders have very little to do with food, the food is just the manifestation of the problem. In most cases the issue is control - young girls, often 'people pleasers', feel they can't control what is going on in their lives, but they CAN control what they eat, so they do.
That's a very simplistic version obv, but that's what it boils down to.
My GP was so impressed with my recovery that she sent all her eating disorder patients to the psychologist I went to - she was fantastic and helped me turn my life around.
My advice would be to try to find a therapist who takes the focus off the food and helps with the REAL problem - sounds blindingly obvious, but a lots of ED treatments don't do that and they are the ones that will fail in the long term.
HTH