Beat one up at a time... gotta love her strategy and sheer will! They will do that when pulled from the flock for as little as one day sometimes. That’s why they say to stop a bully the best thing you can do is to isolate him for a few days and return him to the flock. He is now at the bottom of the pecking order and has to earn his position back. So they don’t forget I don’t think. They’re just low rank until they care re-prove they’re still a hard ass flock dynamics are kinda like middle school girls all forced into one small room after they have gotten pms. It’s funny, but true. Hens can be bit?$y and roosters, arrogant and super rapey. I enjoy watching them and trying to predict what they’re thinking/ their next move. Usually I’m half right a fraction of the time.I had my whole flock almost kill one of my hens. Fudge, my little BB Red hen was sick so we had to put her in a separate cage for almost a month. When she was better, she wanted to set. So I let her and she raised I think 6 chicks. I put her in with the flock and they started to attack her. It's a good thing I had the cage unlocked. I ran in there and saved her. She has a few scares but now she is one of the main hens. She beat one up at a time. It's like they forgot her. I don't know why. I had her in the same coop where they could see her. Everybody is fine right now but the are a little edge cause of the winter weather.