I bought a 4-5 month old Ameraucana pullet this morning, and now she is REALLY sick! She is making loud noises when she breathes and when she sneezes, she shakes her head and it sounds like she is barking and crying at the same time. (Really weird noise) She was running around fine with the others where I bought her from and was looking great. I looked her over and there were no signs of sickness or injury. The coop that she was in was extremely clean, and the coop where I have her was thoroughly cleaned yesterday in anticipation of her arrival. Her poo is really watery, and she doesn't want to do anything. The Marans pullet that I also bought this morning is doing fine with none of the Ameraucana's symptoms. Does anyone know what this could be or how to treat it ? Any advice would be GREATLY appreciated !