My year old BR hen came in from free ranging with the rest with a limp and an odd attitude. I think her limp is just because she lost a nail on one of her feet (the one she was limping on), but upon further inspection, she had an extremely poopy bottom. My mom cleaned it off to find that her bottom was almost bald! That was yesterday, and today she is staying in the shady area of our run, and not moving around much. She does not look like she's feeling too well (sleepy, very droopy tail feather, half-close eyes). She has been eating and drinking still, as far as I know, and we got an egg from her yesterday. Does anyone have any suggestions on what's going on with her and how to treat it????