This hen is 1 year old and is the lowest on the pecking order. She's lately become lethargic and doesn't come out of the roost -- in fact, she sleeps on the hay in the egg box all night. I noticed that her comb(s) are pale -- orange instead of the typical bright red like the other hens. Any idea what could be the problem? The other hens are acting fine. I don't notice the poop being any different than usual.