With what was said earlier, if she cannot take care of herself/ if she can't move around or get to water and food without help, you should either consult a vet for a professional opinion to see if there is something you can do. If you don't have a vet or the money, I would say her quality of life is bad if she can't function normally on her own to get food, water, roost, dust bath etc. I've had experience with a blind chicken, and as much as I loved her, she just couldn't eat and drink as much as she could- she was as thin as bones. Anyway, if a chicken can't live a happy functioning life, it's cruel and selfish to keep them alive just because you love them. In my opinion, I would not spend thousands of dollars on her, and would have her put down if she can't function. It seems harsh, but its up to you to be the judge if she will be suffering or not.