I have a sweet little white bantam that we bought a few months ago. She is laying age, but I don't really know much beyond that. She hasn't layed an egg in a week or so now. Over the past few days she has not wanted to leave their coop- just sitting in a corner, but not using the roosting perches that she used to use. Her nostrils on her beak have turned dark. Although I haven't ever looked at her breast area before to know how covered it was with feathers, it is bare with a couple of stripes of feathers down each side of the breast bone. The skin is papery and yellow. Maybe it is always like this, just covered with feathers? Not sure. She will come down and scratch when I put out cracked corn, but goes right back. When I reach in to pet her, she fluffs up and "purrs", but it's not a happy purr. More like she doesn't feel good. Her eyes seem normal. Her comb is still red, but seems a little less than healthy looking. Any ideas what I'm looking at?