I have a chicken, not sure on age, might be 2 and she is a bard bantam. Recently she has taken to sitting in the nesting boxes and staying there. I have had broody chickens before and she is not broody. She gets up to eat and drink and comes out if she knows there is a treat being given but other then that she sits in her box. She doesn't appear ill, I don't think she is egg bound but I am going to examine her a bit tonight. Thoughts?