Hi I have a very sick brown leghorn chicken. She is very lethargic and has a droopy discolored comb. She hasn't been laying or eating for a couple of days. She drinks a lot and sleeps a lot too. Her feet look great and my chickens free range every day. They are also kept very clean and with fresh food and water. She also has runny diarrhea.... She was always a very wild hen and now she barely runs away... Very sad. Please help ASAP we are worried that she doesn't have much time.