I began with two black australorps in a 2x2 meter coop in my backyard. I got them at 4 weeks and moved them to the coop at 8 week. One night I neglected to secure the door and I can only imagine that a fox took one of my girls. My remaining hen was very shook up, with reason, so I purchase two new hens of the same breed and same size/age. My original hen did not react well and attacked the newbies violently. They were only acquainted for a few hours I have moved her to different spot to allow them to get comfortable. What should I do next?