Don't concern yourself with her little line. She's just testing the waters by saying something ambiguous. Go after her like you would if you were sure she liked you. You'll learn to enjoy the potential for being burned, it means you've graduated to someone with a sac.
And judging from the question, you may decide to give up if you meet any resistance. She may feign disinterest initially just to see what you are about, plow through that. Only take a flat-out rejection.