If a girl makes eye contact, smiles then looks down, what does it really mean?

Anonymous
I happen to walk by this girl at a store, we have met each other a 6 or 8 times now she works there. When I walked in she saw me, I saw her, we both made eye contact, she hi and smiled at me first. I nodded and smiled back whilst making eye contact then she looks down to da floor in a kind of sweeping motion. Is she interested in me or am I getting the wrong message here? If she is interested in me how long does it usually last? Im so confused...
If a girl makes eye contact, smiles then looks down, what does it really mean?
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