I got a new girl in August to replace a rooster and quarantined her in a wire dog crate in the pen for 2 nights and days before integrating her in. At first, once she was out of the crate it was very volatile, you could cut the tension with a knife. She was definitely low on the pole. The other girls, especially the two on the top were so mean to her they were pecking her right in the eyes, and I think she had a cold to boot. So I sat in there for a while each of the first couple of days and asserted MY authority as "top" chicken, and they settled down quite a bit within a couple days. She still gets less treats than the others, and gets picked on a bit because she is lowest in the order, but not nearly as much as before. But she eats like a pig, her cold is gone, she's not weezing or sneezing anymore, her color is coming in nicely, and she's doing the squat for me. She's a sweetie, tries to follow me out of the pen when I leave, and has succeeded twice!