I have an EE hen that seems to be miserable in the current temperatures. For the past few weeks she has pretty much stayed in the coop, not moving around much and not overly interested in treats. I thought she was sick but then we had a few warm days and she was out and about like normal. Now that the temperatures have dropped into the teens and single digits again, she is back to not leaving the coop and just sitting there all puffed up. She is not sneezing, there is no nasal discharge, she just seems lethargic. I was tempted to bring her in the house and see if warming her up would help but I don't want to create an even bigger problem for her when I put her back out in the coop. I am pretty sure she is still laying occasionally, but not absolutely positive. She is the only one out of 16 chickens that seems to be having this problem. The others seem to be just fine. Does anyone have any suggestions on how to determine if she is just not acclimating to the cold or if she is really sick. There are no obvious signs of illness and I did break down and put a heat lamp in my coop which I swore I was not going to do, She is huddled directly beneath it and does seem a bit happier.