Yesterday I noticed one of my hens was chilling alone in the coop. She had pooped and although the color was normal, it looked like maybe some grass was in it. Just now, I let the dogs out to go to the bathroom, and noticed she slept outside all night! She is wet (it rained) and her comb is darker in color, almost like purplish. She turned 4 in the spring. Is she dying? I don't have a vet around here that does chickens. I have no clue what to do. She won't move. Old age? Help please!