I've been working on intergrating our 3ish month old pullets with our 4 month old pullets. The bigs girls have only been using their "big girl" voices for a few weeks. The little girls are fully feathered, similar in size but still smaller and chirp like babies. So far everyone has been well behaved, after a few weeks keeping them in the run but separated we let them out to mingle while we watched and they really get along now. At night we've been closing them in the coop but letting the little girls choose the outer section of the coop while the big girls slept in the roost. Fast forward to tonight, I come out to close up the coop and all the girls are resting together on the same pole in the outer coop so I thought it might be a good time to have the little girls start sleeping the roost. So I shuffled them all into the roost and the alpha pullet ( we think she's slightly older than the others, she seems to be maturing faster) started really picking on the little girls, more so than I've ever seen her previously. So I opened the roost door, let the girls shuffle back outside to the pole and isolated Big Red in the roost by herself for the night. I feel like such a bad chicken momma, if I had let them alone I could have avoided all this. Do you think I should just let them choose where to sleep and leave it alone?