I have a 5.5 year old buff orpington that came out of the coop today unable to walk on one of her legs. It's not red or swollen. It is a bit warm but I think that's from holding it against her body. She drank some water but isn't eating. She's a bit puffed up but otherwise doesn't seem stressed at all. I brought her in the house in a dog crate to monitor her. Any ideas what could be wrong?