If a girl teases you, does it mean she feel comfortable with you or likes you?

I met a girl few months ago, she doesn't talk much, she is kinda shy, but after talking more, she is kinda open to me, sometimes she teases me, but she does it in a innocent way, she is younger than me, it's obvious when she gets shy if I tease her.

If a girl teases you, does it mean she feel comfortable with you or likes you?
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