If she has chicks with her most of the time, she might be okay. For short times between broods, you can play one of the 10hr cluck recordings 24/7 from youtube. That's what I used when I had a chicken who needed to be away from the flock for a few weeks due to an injury. Or you could house her with the two or so hens who pick on her the least.
Just wondering if you have too many roosters for your flock ? Since chickens are flock birds I would either get her a silky friend or put a bantam or two with her.