I have a hen that hasn't moved much from the nest box. She is only about a year old and has been laying eggs. I have only seven hens, no roosters, with enough space in the coop. Lately I've noticed that the hen has been in the nest box each time I go to the coop. I didn't think much of it at first. I thought maybe the hen was just trying to stay warm. The weather has been very cold the last few weeks. However, when I lifted the hen from the nest box to check for eggs, I noticed the hen has lost a lot of her feathers underneathe. I also noticed that her comb is a little white on the very tip. Can anyone tell me what is wrong with my poor hen.