I recently got an adult RIR hen and she almost immediately started going through a molt. Now two months later she has her feathers back but I see that she now has a few solid white feathers up near her hackle feathers on her back. She didn't have any white feathers before. Can a chicken change colors like that? Could she be a mix breed instead of just RIR? She originally came from the local feed store as a hatcheray chick.