Glad it went well.Update: Thanks again for all of the thoughtful replies. As of this weekend she has officially been rehomed two hours away with my uncle's flock. After spending a few hours in a crate where she and the flock could see each other, she integrated into a flock of Buff Orpingtons and Speckled Sussexes. I don't know if these breeds are particularly laid back or what, but the ruthless pecking pile-on I was worried about never came to pass. There was definitely pecking, but nothing too bad (it seemed to me that the rooster would step in and protect her if the pecking got to be too much, which surprised me a bit), and by the morning when we checked in on her she was roosting right in the middle of the flock. We're heartbroken, but glad she's somewhere where we can visit her often.
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Sounds like the rooster is doing his job - letting his gals battle it out, but keeping it under control (referee). Hens have their own pecking order, the rooster "revolves" around that and helps control drama.