I have had a single hen for about two years. This year I bought 3 new chicks and raised them for the last couple months. They are what I would say their lanky teenage stage. I let them out of the cage I raised them in out in the barn. My old hen attacked them so I put them back in the cage. She hangs around the cage and tries to get at them. My question is will she kill the younger chickens if I let them out on their own or is she just trying to let them know who is boss.