Our year old Easter Egger hen died suddenly today. Noticed she was a tad listless yesterday, and this morning worse. She wouldn't leave the coop when we let them out this morning. Instead, she stayed inside coop and sat on floor, motionless and listless. We were gone for several hours and went to check on her. She had passed. Nothing appeared wrong, checked vent for egg bound, appeared ok. She had watery stool this morning. Unfortunate and sad, but relieved she didn't appear to have suffered. Any ideas what may have been going on with her? Thanks....