I have a mixed flock of 6 hens and have been having some issues with my Leghorn. Initially, she started laying about 2 weeks before the others, so when the others started laying, she was pretty ****** they were in "her" nesting boxes. She left the more assertive hens alone, but she pecked one of the buff orps bloody. The others followed suit. (This was a couple months ago.) I took out the pacing buff orp and the leghorn. I put the BO back at night and she calmed down after a couple days. The leghorn continued on the same path after a week, so eventually, I built her a timeout pen within the run. Little by little, I took down the cardboard that was blocking view so that they would become comfortable with each other. When I let leghorn out, the other BO went after leghorn (are they self aware?!?!?), but generally they were all okay together. Leghorn, however, would sit in the pop hole not letting anyone in or out, and I began finding eggs in the run, so back she went to timeout. Meanwhile, I built a new coop. I put 5 hens into the new digs about a week ago so that they could settle in ahead of leghorn. (leghorn is in the old coop temporarily) So, I'm going to give leghorn her last shot soon. Timeout pen has been reconstructed and is ready just in case, but she can't stay outside in winter. I'm going to add some roosts in the run so that hopefully she can feel some dominance without guarding the nesting boxes. And I ordered pinless peepers a few months ago, which I haven't tried. Any other suggestions are welcome. It's really her last shot with this group, and I'd like to give her every chance to get it right.