I have a RIR hen that is acting a little funny. By funny I mean that she is staying in the nest box. She has not showed any signs of being broody. She does not scream at the other's, she has not plucked the feather's out under her belly, she does not flare up like a turkey..... she laid a egg yesterday. I locked her up in a cage, and just as soon as I let her out she ate, and drank and then went right back to the nest box. Is it possible that she is wanting to go broody or should I be looking for some other problem? I have checked her over pretty good and do not see anything visibly wrong with her. Any advice would be appreciated. She has never went broody before and she has alway's laid an egg a day except for when she was molting!