Chicken being picked on by one other chicken

[KirbyH]

I recently posted about an injured bird who was being attacked by the flock. She has healed. During her recuperation she spent nights in a crate in the main coop and spent days in our garden area with the silkies. When I let her out with the main flock this morning, the oldest hen instantly went after her. So I put that girl in the crate to see if the rest of the flock bullied the newly released bird. So far no sign of that. My thought is to try and social engineer some alliances by regrouping the birds for a period of time or simply putting the offending hen in with the silkies for a week (unless she misbehaves toward them) while the previously injured bird is accepted back into the flock. Or is this just doomed to repeat? Anybody, got suggestions?

 

[LittleMissCountry]

I recently had a similar issue. My lowest pecking order chicken had bumblefoot and was inside for a week, recuperating. When introduced back, I did it slowly, putting her in the run in a crate, so the others could see her but not get at her. Even with that, one of the chickens kept viciously attacking her.
I took the aggressor out and kept her in the house 3 days, while the other got reacquainted with her flock. After 3 days, when I brought the "mean" chicken back out, the bullied one was still terrified of her, but the others put her in her place and she was no longer top chicken. She was too worried about trying to fit back in to do more than an occasional peck at the other chicken. After a few days, they are all good.

 

[KirbyH]

I have had to separate the mean chicken from the flock indefinitely. I'm going to try pinless peepers on her because she wasn't just terrorizing the one chicken, apparently she was terrorizing all the other hens.