I have one hen that when she lays, she will scream at anyone who even gets near the coop. If you put your hand near she'll bite you. She lingers on the nest but doesn't stay. Yesterday and today it was as if she got "stuck" in nest mode and when she came out of the coop she was picking things up and throwing them over her back "fluffing nest" style for an hour. Like some sort of tic. She is only 6mos old. Is she trying to go broody or is this common behavior?