We have three BO and three PR girls, all eight months old. One of the BO's, Sandy, has always been the smallest, always been bottom of pecking order. We finally figured out that she has vision problems after watching her peck at, and miss, food on the ground. She always seemed to get by, though, and laid eggs ( though small) along with the other girls. Yesterday, I noticed her standing off by herself, and she refused to come back to the coop at dusk. I picked her up and put her in. This morning, she never got off the perch inside the coop, and was lethargic. I witnessed her poop a watery, yellow poo, and her breathing seems labored. I separated her from the others into an adjoining fenced garden, and set out food and water, which she ignored. I even tried to give her water with a dropper, but had trouble getting her to accept it. I also cleaned all the pine shavings litter out of the coop floor, and replaced it with fresh litter. Any ideas on what could be wrong with our little girl? My heart is breaking!