One of our silverlaced wyandotte's was found with a large wound on her back this morning. It was unclear if she was attacked by something or if the other hen's have just pecked her. The hens are in a large fully enclosed coop and run so it would seem that there would be signs of an intruder predator, but we found none. The wound is about 2 inches across and is down into the muscle tissue. We brought her inside so the hen's would not continue to peck at it. What is the best treatment? Should be just clean it and put antibacterial ointment on it? We plan to keep her separated until it is healed. Any suggestions are much appreciated, this is our first major chicken injury and we have only had our flock since May.