If the skin and fat have been ripped off, and the muscle is exposed, I would get some Hibiclens or chlorhexidene and water and clean the wound. Plain Neosporin or Triple Antibiotic Ointment is very good to keep the wound from dripying out, and use it twice a day. If there is no infection, (pus or a bad odor,) you can just clean with salineafter a couple of days and use the ointment. Leave open. Keep her inside a dog crate in the coop with the others on a clean towel.