My 1 year old red sex link has some feather loss in her tail and around her vent area. Is this a result of the other chickens pulling out her feathers, or a disease? I had a hard time getting a photo of the area, she wouldn't keep still! What should I do, if anything. It has been extreamly wet this week, over 3 inches of rain, but I can't imagine that would have anything to do with it. Thanks.