How come she won't sleep with me?

I met this girl a couple of weeks ago at a club and we went to her place and we kinda of slept together. (I had whisky dick, but still managed a to pop it in for a bit)

The next couple of weeks I have picked her up from her place and taken her out on 2 dates, however when i drop her home all we do is make out in the car for a bit and she goes home and doesn't invite me in. Do you think she doesn't like me or maybe forgot that we slept together?
How come she won't sleep with me?
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