I brought home 3 bantam cochins and one had been in beat up by a rooster already. It is missing it's tail feathers and some neck feathers. The two other bantams that are with it keep picking at the new feathers that are trying to grow back in. How can I get them to stop and let her get her pretty bushy tail grow in? If I separate them, how long will it take for it to grow in? I hate to have her by herself. Thanks!