I have a 1 year old Rhode Island Red. Three days ago noticed she was sitting around, and had laid an egg with a very thin shell that had broken from her weight. Next day still lethargic laid a no shell egg. Removed her from the flock and isolated in a dog kennel yesterday, as she seemed to have a yellow loose stool. She would walk a short distance when you let her out, and then sit. Lays with her head down. Started antibiotic in her water. Been giving with a childs med dropper. Have always given hens electorlites and vitamins in water, along with oyster shell, and commerical feed. Last night picked her up and her vent was contracting. Lubricated it with olive oil. If she has an egg stuck what else can we do? She seemed better last night, but today seems worse. So far none of the other hens seem to be showing any signs of illness.