We have a white leghorn that is six months old. She has been laying eggs everyday for about three weeks. For the first time she is now sitting on her eggs for almost 24 hours. She screams when other hens(we do not have a rooster) approach the nest box or when we confront her. She has not been eating, drinking, and pooping, so we are wondering if we should remove her from the nest box. We have two side-by-side nest boxes, other 5 hens are laying outside in the yard. We are pretty new to chickens, so any advice would be helpful. Thank you.