I put Violet (the violent) in a cage on her own in the pen, covered with a sheet so she could not see the others and they could not see her. After 3 nights of this, I thot I;d give her a chance out. She wasn't out 2 minutes when she was up to her harassment of Vernie. By the way, the minute I locked her up, all was peaceful in there. Preening, dust bathing, serenity. So, now she is in a cage across the yard away from the girls and she will stay there for a week. I read that chickens forget after a week. I wonder what's going on in her little head? She doesn't cry to be back with them or try to get out of the cage. She has a perch, food, water, greens, all the comforts of home. Maybe I've made it too nice for her, she'll think she's the queen and not want to go back.