I had three chickens; a Wyandotte, Easter Egger, and a Cochin. When they were only a few months old I got two Ameraucanas (all the same age). I introduced them very slowly, keeping them in a pen next to the run for weeks. When I finally introduced them one of the Ameraucanas stood her ground and quickly moved up in the pecking order. The submissive Ameraucana has always been shy and submissive but they accepted her with no issues. For several months they all got along but the two Ameraucanas would sleep separate from the other three. Then a couple months ago the dominant Ameraucana joined the three, so the submissive Ameraucana has been sleeping alone. Then all of a sudden a couple weeks ago they started attacking the submissive Ameraucana (they had all been living together for 6-8months without issues). Chasing her nonstop, jumping on her and pulling out all her feathers and not letting her access the food and water. Her sister then betrayed her as well so they all were attacking her. So I took out the two biggest bullies (Cochin and Wyandotte) and put them in a cage for a week and a half. Slowly the dominant Ameraucana and Easter Egger started sleeping with the submissive one. Since the three that were uncaged were living together fine after a week and a half I decided to let the bullies back in. The bullies immediatelely started right back attacking the submissive Ameraucana AND now attacking the dominant Ameraucana as well, and she didn't defend herself like she used to. So after observing them for a little while I decided to put the bullies back in the cage. Any ideas of what to do now?