I am new to chicken keeping. We have 10 hens, 3 of which have been laying consistently (1egg/day/chicken) for the last month or so and we have 7 others that are just getting to the point where they are ready to lay. We noticed about a week ago that one of the older hens was not laying everyday like she had been, but initially didn't think too much of it with the weather that we had. We noticed earlier this evening that her one eye is staying closed when she is up and about. She seems like she is eating and drinking ok, but her movements seem a little slower than usual. I'm not sure what I should be looking for or what I can do for her.