I have a hen that I adopted because someone dropped off in my neighborhood. I am trying to get her introduced the the flock (4 hens, 1 rooster & 5 chicks that are 4 weeks old). None of the hens or rooster will let her out of the coop. They are fine if she is in the coop but if she comes out they tear into her. I don't have a way to seperate her. What should I do?