My girls, year and a half old Black Stars, have not left the coop for a few days. I open their run and they normally can't wait to get out in the morning. We live in Colorado and have some cold weather lately (in the teens at night) but normally they come out in any weather. They seem to be eating and drinking OK; they're not laying right now because one of them was molting and the other one doesn't lay then either. Any thoughts on this?