I have a hen that, after she finished laying her eggs, she goes back just to sit. She lays in the morning. This afternoon, around 3 she went into her nesting box just to sit. I've also noticed she has been pooping in the box. She always gets up after her egg is payed and goes out to play for a few hours. Then in afternoon sits in the nest. I'm wondering if she has stomach cramps and feels like she has to lay even if she doesn't. Just lately, she has a poopy bottom. Could this be worms? Broody behavior?