Try talking like a pirate with her.
Arrrr, shiver me timbers, but prepare to be boarded lassy. There's a battery of six inch cannon aimed straight at the waist of your ship, ye lady pirate, arrrrrr, and a troop of rum-soaked, cutlass swinging cretins ready to clamber aboard.
Arrrr, scrub me barnacles and swab me poop deck, matey. It's a lonely night on the foc'sle or the mizzenmast for ye tonight, arrrrr.
Arrrr, it's a pirate's life for me, three squares a day and all the battle, looting and ravishing a lusty scallywag like this here seafarer can handle. I think maybe some torture is in order before ye walk the plank, matey.
...bad boy grinning the whole time of course. Since a ninja don't have any colorful banter the pirate talk is probably the way to go no matter what her answer, assuming she does answer. I'd do something like these things because it's funny and it throws plenty of double-entendres in there. Chicks dig that stuff. Cheers