We have a 1 year old freedom ranger. She is a good tempered chicken and a family favorite in the flock. She was missing last night at turn in time. We found her hiding in the flower bush. When she eventually got up she expelled a large (2-3”) pc of tissue from her vent. Image attached. She is a rather large hen and does not roost so she always has a messy butt. Today I bathed her so that I could inspect the vent and it does not seem to be prolapsed. She is drinking water. She is walking around lethargically. She is pooping white liquid with green…and there is almost a whistle noise when going. She is currently separated from most of the flock with the exception of her two “sisters” on fresh shavings. I hate to see her suffer! Any ideas?