I have a 1 1/2 year old Leghorn hen who has not been moving around much for the past two days, puffed up and her comb is mottled dark red and purple. Her skin all over seems very red. She feels light, so I'll assume is not eating very good. Its been below zero here, but they have a heat lamp on them all day with plenty of water and pellets and occasional sunflower seeds. They aren't going out much in the snow but are getting fresh air and access to day light. She stands on one foot with eyes closed all puffed up. ): She also does not smell very good. Her crop is empty and nothing unusual in the nest box.