Hope everything worked out for you!
My kids have the same issues with our birds........ (my daughter is attached to a Leghorn, and my son to a Delaware)
I recently had to re-home half of my flock, and the "head Hen" was a Delaware named Dellie (My son named her)......... She was HIS baby.......
I had to break it to him that Dellie had to go, and he was angry, upset, crying, etc............
I first took him out, sat him down, and had him watch Dellie as she ran around pecking the other hen's vents, pulling feathers, and much more............ Then I sat down and asked him what HE thought we should do..... I explained that Dellie was old, and was changing to a mean hen (dont ask)............ I explained she was picking at other hens, hurting them, ripping out feathers, breaking skin, and making them bleed, and that some have died because of her, and that more were going to get hurt in the future...........
After much thinking, he declared to me that he thinks we should find her a new home....... (I agreed, although I did not have it in my heart to tell him that she was going to be sold to someone who was going to COOK her......)
He was happy, and Drama was over..........
I think HE, is MUCH more comfortable with the decision than I am at the moment........... I raised her since she was a Baby......
I do hope it all worked out for you...........