“It was the last night of her training. She had the makings of a great Jedi…but Leia believed that she must serve the galaxy without a sword, like her mother once did. She surrendered her saber to me and said that one day it would be picked up again…by someone who would finish her journey.”
I like this the best out of what we have so far, I think. It’s vague enough but hints at the political stuff. I would like to allude to her political involvement as a reason, but avoiding saying it was the last night of her training helps it feel less weird for this to make her quit.
Another stab at it: “I had begun to train her, and she had the makings of a great Jedi. Leia told me she felt it was necessary to serve the galaxy without a sword, as a diplomat. She surrendered her saber to me…”
Or maybe: “I had begun to train Leia as a Jedi. But there are other ways to pursue peace and justice. Leia believed she must serve the galaxy without a sword. She surrendered her saber to me…”
What an embarrassment of riches with this AI voice.