With my experience after mine got attacked, she did not make it after I tried to help her. She wouldn't eat on her own or walk around. I was trying to feed her by hand but I knew it wasn't going to end well based on how she was acting. I usually will do a 2 -3 day rule depending on the situation and help aid them back to health but if there isn't any change especially if they aren't eating or walking anymore its better to not let them suffer. But of course to better the chance of saving your chicken, taking her to the vet is the best route but of course that could cost a lot of money depending on what is wrong with her. Keep in mind though, if you are trying to help her yourself she may seem to be recovering because it is the bodies job to get to work when something is wrong but when dealing with losing any part of the body can come along with infections especially latent infections. In these situations the choice on how to help is a personal decision.