"Y'know, you're more clever than you let on. How 'bout one last battle. Not a battle of strengths, however... A battle of wit."
If she responds no (or stays silent), "Hah, afraid of losing? Maybe you really are some dumb whore."
If she responds yes (or interrogates further), "Okay. I have a series of puzzles planned out for you. If you solve them... You win. However, if I win them, then you owe me one last fight. No weapons. Just pure willpower."