I have one Buff Orpington and three araucanas in my flock. The three smaller araucanas seem to be jealous when I pay any kind of attention to my Buff. I feel bad for her, she even has a little ring around her head where I have noticed that one of the more aggressive hens sits on her back and pecks at her. Today, I was rubbing her while squatting low and one of the other girls came right up and pecked her right in the head... She gave a little bawk, but overall is just so passive. What can I do if they are really ganging up on her?