I started my flock BECAUSE a poor chicken was getting pecked bloody in her original home at my mom's. So, I took her and 2 others home. It's been about 5 months. The wound has healed up, and she's my best layer. So then, I raised 7 more from chicks. Everyone was fine and happy. I let them all roam in my fenced in backyard, and they just got a brand new palace of a coop to call home. But, the last 2 chickens at Mom's were miserable. It was just the 2 of them in a coop full of mice and a small dirt pen outside for a run. They can't run free because my parents have big dogs that love killing chickens. So, I took them. I really hoped the huge open space and being the new bird in the flock would make the mean chicken leave her old victim alone, but it was like they hadn't been apart for a day even! She went right back to pecking her AND yanking feathers out of my younger birds to boot. I've isolated her out of sight of the others. But, how long should I leave her out of the flock? It feels cruel, but not as cruel as unleashing the abused chicken's bully on her again, I'm sure. Is it the right approach? Everyone does have room to run from her, if she's out. Should I just let the pecking order happen? How long do I let her hurt the others before it's too long?