To only take water and food when given to her this far out from the attack indicates very serious issues. As already said, I would be inclined to kindly euthanize her. So sorry!
When I started keeping chickens, I had a neighbor who had a lot of chickens so I would ask her questions. I asked her about the tough decision to cull chickens. Her reply "You put your "farm face" on and do what needs to be done." That has helped me so much over the years.
Whenever we have...
I have no idea, but I am sorry this beautiful boy is going through this! Try searching here for an article...I hope someone else sees this who might be of more help. Anyone? Any ideas?