Should I message her again?

I met this girl working at a sandwich shop and she seemed interested in me the couple of times I went... long story short, I added her on Facebook made a few jokes and she laughed and then said "I noticed your taking classes at SFU (ya I was totally creeping)" in which she never reaponded (which I get cause it was dumb to say) anyways it been a almost three weeks I was just wondering if I should message again or no
Should I message her again?
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