She has to leave the nest to poop. Has she? I'd remove her from the nest once a day if she hasn't. My first broody came close to death (she had no eggs under her and we couldn't break her up). At about 22 days, she couldnt walk and her head would twist around backward. I was advised to squeeze a vitamin E gel cap in her mouth and syringe water in. She snapped out of it, much thinner, but at least she was alive. All this was with us taking her off the nest once a day. At the end, she quit eating and drinking. Crazy hen.