I just introduced two new hens yesterday.
I went well when they were free ranging but was a total flop once they were all back inside the run.
Here is what I will be doing. I am setting up two separate pens, one in the coop and one in the run. I will keep the two new birds in these pens for two weeks and then try to release them again into my flock. I will use the look but don't touch method I have heard so much about.
Try that with the mean hen. It will take her down a notch.