If a girl laughs at everything I say?

And is usually smiling whenever we talk and teasing each other, is that just plain friendliness or is there something else here? She usually seems a bit on the quiet side but when we talk she opens up and we joke a lot. I've caught her several times doing the "i look at you, smile at you but then I look up and away while still smiling" face, if that makes sense lol. Thanks for the input.
If a girl laughs at everything I say?
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