Jacoby wrote:
Some girl did this during high school to me, ...
I had a girl classmate try something similar with me. It was my senior year of high school. I remembered her from the previous year, when she heard about me from a friend, and we passed each other in the hallway. Like in your case, she was very good-looking.
She tried to prank me by talking and acting like she's interested in me. Having been pranked similarly a few years earlier, I knew it was all BS. So I pretty much let her keep doing what she was doing, just to see how far she'll go, while not showing any indication of believing her, like asking her on a date or something. She once tried hugging me closely, to give me an embarrassing "reaction" in public. All this resulted in an ongoing banter of sorts. I managed to remain civil throughout, to keep her from siccing her boyfriend or some other guy on me.
All those interactions had an interesting effect. By mid-spring of the school year, I noticed she warmed up to me quite a bit. Not romantically---far from it!---but she did start treating me in a friendlier manner. Maybe not as a true equal, but as a lovable underdog of sorts. She was also being my first hug from a hot girl, so I guess I broke even in a way.