I have 4 hens, one of which is a black Cochin. I have a BR rooster. The rooster has basically rejected the black Cochin as part of the flock. He chases her to the perch or plucks feathers from her head until she runs for the perch. She has resigned herself to grabbing a quick bite of food and running for the perch, where he leaves her alone. She is very timid and is at the bottom of the pecking order with the hens too. She is getting thin and I am afraid she won't get enough nutrition. Is there anything I can do to help her?