I have one hen who has recently started spending most of the day sitting on eggs in the nest. It's a pain to get her off the nest and collect the eggs, none of which are usually hers. I have no rooster, so I'm not expecting any baby chickens. So why is she sitting on the eggs all day long? And what can I do to make her stop? I noticed this morning that one of the other hens was developing a new nest in the coop. I think they're getting annoyed at her.