So we had two chickens that have been together since birth. They are a year old. We have been thinking about adding a third (max we can have in city limits) for awhile now and had a casual chat with MIL about it a few days ago. Well, attempting to be helpful, she surprised us with a new chicken (her neighbors were downsizing) and put her in our existing coop while we were away, knowing nothing about chickens obviously. I was mortified when she called and surprised me. We came home and my dominant hen was terrorizing the new gal badly. Newbie and my other hen were getting along surprisingly well. So I put up a diving wall (chicken wire) in my coop and put my dominant hen on one side and the newbie and my docile hen on the other. I figured removing the dominant one would help settle the playing field and get newbie a chance to settle in. They are still able to see and get right up next to each other, but can't harm each other. My main issues are lack of quarantine. I didn't see any point in removing newbie since she had spent the day with my other hens already. She appears 100% healthy, but of course there's no way to tell. How worried should I be? What should I be watching for? Also is there a better way to get my hens acquainted? Or should I keep the set up the same? I'm overwhelmed and quite frankly irritated with MIL despite her meaning well. Help!