Girls, have you ever done this at a party?

I was at a party yesterday and there was this girl whom I had made eye contact with several times already. However, I am 19 years old and she's only 16 so despite the flirting I did not go talk to her.
She kept dancing close to me, though and always seemed to find me on the dance floor.

As she was brushing up against me again (she could move but she did not) I finally gave in and wanted to start grinding her. She did not push hard against me though and did not seem to respond that well to me putting my hands on her sides. She did not look at me or move away, but did not start really grinding either.

I was like WTF and just went to get a beer, she left the party shortly after.
What was her game?
Girls, have you ever done this at a party?
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