Let her take you to her chamber.
Then, you can kill her before she calls for help (You can spam Hold Person on her freely until it sticks and then enter TB mode and beat her up if you need more than 1 round)
You can kill her, then if she called for help, leave the area before someone rings the bell (You can loot her key from her corpse and then enter her basement) which will reset the "Temporarily Hostile" effect on everyone else.
You can allow her to put a character to sleep (Has to be a non-elf), then have your party raid her basement while she's down there in dialogue with your character.
