One of our buff orpingtons has recently been spending a strange amount of time in the nest box. I've rarely seen her outside the coop for a few days now. She acts reasonably okay when we give her treats and water, she accepts both, but overall her behavior is on the quiet side. This morning we picked her up and she was sitting on a couple of eggs, but even after taking them away an hour ago, she remains in the box. There's no apparent sign of damage to her skin, feathers or vent.
Any idea what might be going on with her? We have a chicken specialist in town who we can call to check the hen out, but we thought we'd ask here first. Thanks!