Here's also info I posted on another thread that may be helpful.
Ideas: Put some obstacles in the coop she can hide behind, jump onto and run around while evading attacks from the other chickens. ***Always be sure no blocked-off or dead-end areas are created where chickens could get cornered.*** Sacks of feed, buckets, additional perches, trash cans, etc. can be useful. Window frames (with either glass or wire in the middle) leaned against things can also be excellent for a flee-er to run behind and be protected yet be able to keep track of aggressor's travels. Lower-ranking chickens also appreciate shadowy, cluttered areas where they can hang out and not be noticed as much.
There's also a hobbling technique that gets roosters to quit bullying--Don't know if it would work well on hens, but here it is:
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If the "mean-ness" is a rooster problem toward roosters, you can use tape or something to hobble his lower legs together with just enough length that he can walk but not jump up & spur or run really fast. When you put him down, the other chickens sense he is handicapped and generally dive at him (**You MUST stay there to supervise and make sure things don't get TOO rough on him**). Less than a minute of this may get a rooster humbled enough that he never bullies again.
I'm not sure how this would work with correcting aggression toward hens. I imagine you'd be likely to need more than 1 min of hobbling because they'd probably not be as driven to attack him??? I would DEFINITELY separate the other roo while putting the hobbled roo with the hens--otherwise the other roo would take the opportunity to attack him & the hens wouldn't even be part of the interaction.
It can take rooster that was hobbled 2-3 weeks to feel confident enough to hang out comfortably with the others again.
BE CAREFUL WITH THIS TECHNIQUE! Even a little too much time at other chickens' mercy can be very detrimental to thrashee's self-confidence. I think it would be better to do too short of a hobbling session, if in doubt, and then do a second session if needed a couple weeks later.