Wait, are you saying her feathers aren't growing back? Roxy's skin scabbed over and all her feathers came back, we couldn't even tell where she had been torn open and this was a pretty large gash.
Has she molted recently? If not (and I guess even if she has) the stress from being torn open could cause her to go into a molt and then regrow her feathers just like a normal molt, but her skin should heal up on its own. We just used warm water to clean the gash and then some Betadine applied directly to the skin where it was cut open to clean further and prevent infection. Then we gave her antibiotics in her drinking water for about a week and a half. Note you cannot eat her eggs for at least a couple weeks after treating with antibiotics. We also gave her scrambled eggs about once/twice a week, and occasional greens and scratch.
As for the two months we have a barn and a wooden brooder that's in there all the time, just in case of emergencies, etc, so it's not like we had to make room for her in the house or anything, which helps (we have lots of cats).