I am having trouble with my black laced Wyandot, Shirley. She is a bully to the other hens when the rooster is mating them. She stays next to the rooster wherever he is and she pecks the hens' heads during the mating process. This morning, I noticed one of my Easter Eggers was running into the run to get away from such an attack occurring in the covered coop. She appeared to be hobbling and this attack occurred again only worse. Shirley got another hen involved too and when the rooster got off then Shirley jumped on her back and continued to peck her. I shooed them all away. My Easter Egger, Zsa Zsa, just laid on her side. I didn't know what to do but I picked her up and removed her from the others and placed her in our 'chicken jail,' a large dog cage in the yard. Please advise. Should I isolate Shirley, the bully instead?