Should I still approach her?

So I'm a stocker at target and their has been this new associate who works at Walmart now when I went to go clock in she turns around glances for a second at me... I didn't think much of it so later when I go out she is at her cash register and she is staring at me and I would look back and she won't look away so I took this as an approach invitation I go up to her we had a casual conversation but she was smiling and stuff and she even followed me for a few seconds to talk... I don't see her again that day a few days later she doesn't look at me she walks pass me and stuff and she is always on phone smiling and stuff. Should I still approach her or my window of opportunity is over?

On a side note she smiled after our first and only interaction across the room to me
Should I still approach her?
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