I have one chicken that has been sick for a couple weeks, we have 3 chickens that are doing great. I tried antibiotics for a couple weeks and no improvement. She does not hang with the others and seems lethargic. Her eye area is very swollen (red) and foaming in the beginning but now has crust on the eyes. She opens her mouth like she is stretching or trying to "pop her ears". There is an odor to this chicken that I do not smell with the others. Any ideas?