Another option would be to make her make her her own little coop/ run at one end of your large run. I did this for broody hens that are hatching babies or to separate one of I need to for some reason
Try to separate her so they can see each other for about two weeks and they try again. I haven't had this problem but I have read to take them completely away for about 2 weeks and that can work. Good luck. She is so pretty. I hope you are able to keep her