For the past three weeks one of my Black australop hens goes into the favorite nest box and stays there. I thought she might be broody, but there are no eggs. She stays there for hours. The other hens squawk at her when they want to lay. I have picked her up and checked her, but she seems healthy. She comes out every morning with the other hens. She used to go to roost early--like 2 hours before the other hens. Is she just a lazy hen? I think she is my fatest hen!