I would try to take her to a quiet safe area,like the book corner and try and get the other staff to encourage the other children to ignore her and get on with what they were doing. Then I would make sure she couldnt hurt herself and let the tantrum run its course with a few gentle words to try and calm her. When its done I would give her a cuddle if she let me and do some quiet activities till she was ready to rejoin the group.