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Generally no. Some hens can go through neck molts in the spring, so that's a possibility, but they usually just molt around the head and neck, I haven't seen that the bottom is involved. There is some bald areas on a chickens bottom and directly around the vent so maybe that's what you are...

Could be from another bird feather picking her. Those are the usual sites other bird pluck them from. I would spend some time quietly observing them to see if you see anything.