She smiles when she acknowledges me, does she like me?

I work a retail job with this girl. We met about a week ago and had a small chat, we haven't had a chance to have a conversation since then, but we have come across eachother a few times recently. Each time she looks at me with an open smile and good look in her eye, this has happened a few times now. Could this be a sign she likes me?

She smiles when she acknowledges me, does she like me?
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