I had a sick chicken (Josh female) who needed to be separated for about a week. She is in a flock of 4 chickens who have lived together for 4 years. She moved back into the run in a large dog crate. Other chickens didn't really bother her in the crate. On supervised visits 2 of the 3 other chickens would jump on her and peck her. They would stop when I shook something etc. Last night I was so excited. My former sick chicken ran up and roosted for the night. No issues! Except in the morning I saw on the cameras she was attacked again. I ran down and put her back in the crate. I'm not sure what to do. I'm thinking next steps is to lock up the two bullies? Help!