That's interesting. My problem was, I would get her alone in her room to assassinate her, and the first thing she does in the fight is shout that she wants help and then I'm in a fight with 15 goblins. That did not feel right to me.
I agree, it negated the usefulness of actually getting her alone. as it is I ended up going to bed (I was expecting a slaughetr not a fight and it was late) and when I resumed the next day from my save I managed to luck out and have her roll last on init and kill her before she could fight back
