This is our first year with chickens. We have found that one our of hens has been spending all of her time in the nesting box. I'm not sure if she has been eating/drinking. Her comb is shriveled. I've read up on brooding, but I'm not sure if that's what's happening or not. We are also thinking that she might be one of our neighbor's chickens, but he doesn't want her back. Any help would be appreciate!