I hope she starts in the road to recovery soon. I can’t help as much as
@azygous , but my hen Joy had EYP this summer and I know it can be tough on the bird AND you. If she’s having trouble eating, I discovered Joy had little interest in eating pellet food. Something about it made her refuse. When I noticed her eating the crumbs in her dish though, I had a spark of realization, and crumbled up ALL of her feed. She immediately started feasting on the crumbles, and started drinking water with it to. I’m not sure why she refused to eat the large pieces, but she did. Maybe you bird will also find eating the soft crumbles to be easier. l also provided Joy’s crate with a low roost. 6 inches above the ground. It makes it more comfortable to sleep at night, and she spent a lot of her crate time on it.
I hope she will be alright! Keep doing what your doing