What does it mean when a girl smiles at a guy?

Anonymous
Hi girls I'm a single 21 year old male. I like this girl I seen who works in a bar. she usually brings me my drinks she is very friendly. last time she smiled at me when she was on her way to my table. its hard for me to smile so I didn't smile back but I was friendly to her when she asked me how was I doing and I replied I'm fine and then I asked her how was her day she said good. does a smile mean anything? why did she smile at me? she had delivered my drinks like 10 times in the past but we have never really talked so we aren't friends yet. I like her a lot but I don't know how to tell if she likes me in return?
What does it mean when a girl smiles at a guy?
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