She was a rescue we got this fall. She had some minor aggression issues that I curbed over a short period of time; however since the snowfall she has been falling back into her own ways. The major problem is that all four of the hens are spending most of their time in the coop now. Its been very cold here (Today it is 21 degrees out and windy). She is pecking anyone who even gets close to her and demanding all the roosting space during the day. There is MORE than enough room for everyone to roost during the day to warm their feet and the roosts are at the same height. My coop is 4X8 and is about 4 feet tall. It's not the biggest coop but they all have enough space to scratch around simultaneously. And there is a ladder and a small other level to hang out on above the nesting boxes. It's not exciting in there but it's definitely big enough. I have tried countless times to stop her from attacking the other birds. I have nudged her away, picked her up and forced her to relax before putting her back down, actually tried using my finger to "peck" her to get her to stop.. I am running out of ideas... adding more space to the coop is just not possible anymore as we are deep in winter now. Additionally there is space underneath the coop that is enclosed and snow free. And the usually free range but I attached a roof to the outside space and connected it to the sauna which is to the side of the coop door. And I put a wall on the other side to keep out wind. There is only one open space outside the coop. So the comfortably come outside of the coop. Any suggestions. She is our best layer. Lays almost everyday LARGE eggs even now that it is cold and there are few daylight hours. Plus, I do love her. I don't want to eat her.