I have a hen that keeps going after one of my roosters. She chased him out of the chicken coop and made an angry noise as she did this, the rooster ran from her, but she still chased after him until I chased her away, and earlier to day she chased him away from some treats. This is the only chicken she goes after other than that she is fine with the rest. I don't know what to do with her, and I can't get rid of her because she is our only hen that is old enough to lay eggs. She started to do this to the rooster a few days ago but she has been fine with him the last few months. Any suggestions as to what I should do? Just to let you know the rooster does nothing to her he just minds his own business, also can't get rid of him because he does a good job protecting my flock, again what should I do?