I too have felt this way at times where im like, "look we are past the acting like we dont like each other kiddie shit..." but some people either dont turn it off or you yourself havnt reached that point yet.
Im a very open person, being so i easily feel comfortable with people (and expect them to feel comfortable too). So idk if im wrong in thinking that at some point that 'hard to get' game stops...but i agree with Tripp.
Play it back to the point where they want you, and you are the one going, nuh uh..not yet

. Combine that 'hard to get' attitude with playful banter, kino, and push-pull and it should drive her nuts, in a good way.