Please explain this behaviour

Long story short, met this girl, some days chatting with her, all good laughs, she also starts conversation quite often. We have our first "date", all good, having a beer laughing all good mood. She says she is not looking anything serious, she is flirty and touchy with me. We leave soon as she has night shifts and she is too tired. We make out in her car before she leaves. (Just hot kisses).

Next day no more conversation starters, no more good morning. After a couple of lines she says she is not looking for sex at this moment. Then she doesn't write me anymore. Doesn't delete me either.

What the hell just happened.