We got 4 Golden Sex Link chickens and 1 Buff Orpington without knowing she was a different breed. Up until recently the others have treated her kindly. Now they will go after her and she's spent the last week and a half in a nesting box. Because she would be chased after, we assumed that she was sick and the other chickens were following their instincts to go after a sick chicken. She would fluff up and panic when one of the others got near her and we finally moved her into a separate pen and she's perfectly healthy. Why are they going after her and what can we do? Would it be best to find her a new family of Buff Orpingtons? If we did that, would that flock accept her?