I have a chicken that has suddenly come down sick? My other hen is fine. The sick chicken layed an egg yesterday but I noticed that she seems lethargic and back tail is droopy. She walks some but is mostly laying down. When she stands she lifts her rt foot but I checked it an it seems not hurt or cut or anything. Both hens are fed equal amounts of scratch & laymash & given oyster shell. Her bottom shows white on her feathers. I have inquired on taking her into a vet but hoping I can get input from this forum as the vet bill will be considerable cost & might lose her anyway. Could it be their diet? Could sh be egg bound even though she passed an egg yesterday?