So a few months ago, my family and I bought 3 chickens and a coop. We live in a city where we aren't allowed to have roosters. A couple days ago, one of our chickens, who is very aggressive and has a large comb, started crowing so we decided to take him back to the feed store and trade him in for a female. We decided to get a welsummer that is about 5 weeks younger than our other chickens. As soon as we let her into the coop the other hens started attacking her until she was forced into a corner. They have still been attacking her whenever she is within 3 feet of them. Their run is plenty big for them to be over 9 feet away, but the welsummer hasnt been able to get food or water without being attacked. We don't have anywhere to keep the welsummer isolated and we have no clue what to do. Please help!