ok so heres my situation. I have a speckled sussex that is by far the smallest of my 19 bird flock. One day I noticed that she had been brutally attacked by her neck. So i seperated her and applied ointment and healing stuff. she was seperated for about a week and then just recently I put her back in. only one day passed and she got attacked again. she is currently seperated from the flock. She doesnt seem to want to fight back if they peck her. I dont know who the culprit is but we have 18 hens and a rooster. She is not acting different or anything if anything she is more lively than any other of my birds. What should I do. Please help because I have no idea what to do. Any responses are appreciated.