Please could anyone help. I have 6 chickens but one is looking very ..under the weather. For aprox 4 days she has had runny green, extremely smelly poo. She is eating and drinking but she isn't herself. He has now stopped "hanging with the gang" and stands and watch's them. She will join them sometimes and will peck at the grass. If you watch her she looks like she is falling asleep. Her comb is no longer a bright pink more a dull pink. She looks generally unhappy. On advice of others I have cut away the matted poo clogged feathers from around her back end. Which nearly made me sick because of the smell. Back half is hunched over at times. Vent pulses all the time. I have given all the chickens a three day course of Verm X in the water (which they hate and make for the nearest puddle). I have given her my best chedder cheese, and today rehyradation formula soaked in bread. Egg production from her stopped a week ago. Hen house cleaned top to tail Sunday and droppings cleared everyday. Everything strubbed. She feels warm and still makes noises at me. Felt her tummy and it feels slightly larger than the others????not sure what to look for if anything. Any advice as what it could be and how I can help her???