About 2 weeks ago, we noticed that our BR was starting to bully our BA (both 10 month old and raised together); seeking her out and chasing her down, pecking her in the head, and occasionally pulling feathers out. No idea why (six chickens with 112 square feet to roam in the run and she was even pulling this crap while they were free ranging). So we pulled the BR out and put in solitary confinement away from everyone. After three days, we tried to return the BR and she immediately starting running down the BA again. So the BR was removed, again. As of tonight, the BR has been out of the flock for 7 full days. We put her, in a crate, in the run with the rest of the flock this evening to see what would happen. The BA immediately puffed up and ran as if expecting to be chased and the BR actually tried to chase her every time she saw her! Thank goodness for bars! So what in the world do we do? Anything that may still change her attitude or was this hen made for cookin'?