I've got a hen that's acting a little funny. Her tail feathers are always down and she seems a little lethargic. She's been laying around a lot and her comb isn't quite as red as normal. It has a little bit of a blue hue to it. When I throw out some grain, she lays down to peck at it. I noticed a few sneezes last week, but thought nothing else of it when she stopped. Any ideas?