We are a rooster and 4 hens. They have all started picking on one and tonight we had to remove her as they wouldn't let her roost with them. She hasn't wanted to come out of the pen, and if she does, stays off to herself. We've been treating with antibiotic in water and she does eat but we have to feed her separately. A few months ago we noticed she had little white spots on top of her head. It's hard to tell what it is and now it's coming down the side of her face. Does anyone have any idea. Also, because something seems wrong, is that why the others including the hens are so mean to her. She is the sweetest one of them. Any ideas would be greatly appreciated.