How long is the trick. Pull her out, let the rest of the flock to calm down. Excitement of the new birds can cause aggression. While she is out, rearrange the clutter in your run, or add quite a bit more. Most runs I see on here are mostly empty, very boring 2 dimensional space. So empty, that a bird can be seen by every other bird in the run. Those runs make integration hard.
I call it bowing to the queen. Two birds come together, one is lower, and gives way, even disappears for a moment. Peace. However, if two birds come together, and the queen gives a peck, and the lower bird does not move out of sight, the queen gives a bigger peck and a chase, still the bird is right there in her face, now the aggression becomes even more. The queen does not realize that there is no place for the bird to go. It can get ugly.
Thing is, I have seen birds bow and disappear, to 15 seconds later come right back and eat out of the same bowl right next to the queen. That is what you want.
I would pull that girl for three days, but no more because that can swing things the other way. I am not a great believer in separation, as it can cause more problems. I want my flock to be together. However, some birds will not work in a particular flock. I have been known to remove them from the flock. That is flock management.
Mrs K