How can you tell when a girl likes you or interested?

I'm tryna figure if this girl at my job has any interest in me. I sometimes catch her staring at me and sometimes we laugh about it and other times I'll just catch her staring. She has told me she is talking to someone but that doesn't mean we can't talk as well. But I haven't seen any sign of significant interest so I'm really just going off her overall vibe and the staring? Since it's pretty vague it's throwing me off any thoughts?
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