What does it mean when a girl says "aww thank you!"? how can I tell if she's interested in me or if she I just being friendly?

above_quality2015
Like when I got off work and she was working I went up to her just to tell her to have a good night and she said aww thank you!! And she asked me if I was off and I told her I was and she told me to have a good night and other instances she will say hey when she sees me and we have small talk sometimes she gives me a small smile or she smiles but I don't know smh I hope she does because I really like her
What does it mean when a girl says "aww thank you!"? how can I tell if she's interested in me or if she I just being friendly?
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