I have a 3 year old hen that is very sick. I noticed yesterday that she seemed to be moving really slow. Normally when I let the chickens out of their run in the mornings they bolt out into the yard. She didn't. She did eventually come out but she stayed to herself. Last night when I was changing their water and putting fresh food in, the others, like normal, pounced on the food, but she walked off very slowly to be by herself again. When she was walking off I noticed that she had green poop covering her backside. I gave her a warm bath and tried to check her out. She is missing a lot of feathers on her belly and it is very swollen and filled with fluid. I have her in isolation and she is eating and drinking some. her backside is covered in green poop again.Bless her heart, I don't know what to do for her. Any help would be greatly appreciated.