Got a new job at a supermarket last month (I'm 18 and it's comfy and good pay) anyway, this girl has been giving me signals for the past few weeks and today she went out of her way to walk up and down my isle for no apparent reason, I ignored her the first few times, gave her a smile the third time and on the fourth I engaged in conversation made some remark about her constantly revisiting the isle, we traded some good vibes, she was really bubbly and flirty, she went back off to checkout, half an hour later she comes back down the isle right up to me and says something along the lines of I'm here again, we continue to flirt a little more, she goes off again as she said she's finishing her shift soon. Anyway I have to go to the break room to get something and as I'm entering she's leaving, I give her a smile and as she notices she glances at me gives me a quick half smile and rushes off, this is where the overthinking comes into play, the smile could indicate three things; 1 - Her thoughts were preoccupied and she scrambled to reciprocate my energy, 2 - She was looking at me with contempt, and 3 - She was nervous and it was simply a nervous response.

I don't normally post questions like this but the possibility of it being contempt is really bugging me and I'd like the opinion of people who have vast amounts of experience, no negative energy please this is a genuine question.

Relative information is probably the fact that I'm quite good looking just a bit on the short side.