BTw you can do it just not with dialogue lines. You need to hide one of your companions and kill her while she is distracted and begging, just make sure you do it after the check is made and she gives you the hair. You just backstab her with the invisible - out of combat companion after. Never have all our strength shown in plain sight. in short always have backup!:). For added info on the check, the closest character to her will start the dialogue. I would make sure you park your bard next to her in combat and buff him.
You get the hair and extra 250 xp but not like it matters at that point, but it's good to know you did a true deception on her and she will never bother anyone again!
The game even registers it. They could give us inspiration points for doing it though.
https://ibb.co/pnjyB9D
