One of my wyandotte bantams is missing feathers on her chest, this doesn't look like a broody patch as she isn't broody and the missing feathers are more on the front of her chest than belly, so many are missing that you can see her skin, which is (is this normal) fairly red, she also has feathers missing on her wrists, where here wings tuck into her body feathers. She is in a flock of 3, so over-mating by a rooster is out of the question concerning the feather loss on her wings. She's still laying fine and behaving completely normal. Her comb is red. Anyone know what might be going on?