How to tell if a bubbly girl likes you?

She works at the coffee shop I frequent. Most guys who interact with her seem to think she's flirting because of her bubbly personality.

The other day, she was complaining to me that a lot of guys were bugging her, when I left I told her I was done bugging her and she said something like I'm welcome to bug her.

How to tell if a bubbly girl likes you?
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