I notice that my former victim with the original flock of grown hens is also the biggest bully to the newly integrated pullets -- she's terrible! She was also the only hen who chased and pecked our cats. I've taken to "cuddle therapy" where she gets extra time with me either sitting on my lap, or riding on my shoulder. She was never a big cuddler, but now she flies up into my arms and burrows her head into my neck.
She's the only hen that I allow in my vegetable garden now, so she has some peace away from the "Mean Girls" and doesn't have to act tough with the "Littles" either.