Protecting the Sick

I have a sick hen. Copper is sick. I do not have a clue what is wrong with her. I was looking for her to check on her. When I found her, she was surrounded by several of the other hens. It was nice to see she is being cared for by the other hens. I do hope she gets better but for now, I know the other hens are looking out for her. They all roost in a different barn from the other chickens, but they do it together.