I'm very new to the world of chickens. Actually, it's my wife that started getting us into it. We have 11 hens right now, and 3 of them are Polish chickens with big puffy crested heads. They're very cute. Only we noticed that the smallest of the Polish chicks is bald in the middle of her head! we thought maybe she got into a little fight and lost a bigh bunch of feathers and that they would grow back. They grew back partially, looked like little twigs sticking out of her head, then today we noticed they were all gone again. Her head seemed puffy and a tad bloody in the areas where the stems of the feathers were yanked out. Is this from fighting? What should we do?