Hi. I am a new chicken mama. have two 8 month old Isa brown hens and five 14 week old assorted chicks, all pullets. About a week ago, i put the babies in the coop with the big girls. Now before that, I had the little ones in a run next to the big girls for almost a month and a half, thinking they could look, but not touch. After introducing them to each other, one of the hens, Agatha, has been pretty aggressive. I expect some pecking and chasing to happen, but I am afraid she will kill one. A few times, she has cornered one of the babies and grabbed either a chunk of feathers on a wing, or at the base of the neck, and at the same time, jumps up, and with her claws, tries to claw them, if that makes sense. She will not stop. I have been told that this is not normal, and I don't know what to do. I have separated her a few times, and she has yet to sleep in the coop with the others because of her aggression and my fear of what I will find in the morning. She is a very sweet chicken to us, and I can see she is lonely without her sister, the other 8 month old. What am I to do???