What do a lot of smile emojis mean from a girl?

I'm talking with a new girl that I'm getting to know in person and she keeps using the smile emoji almost every other text. I sent a few back but why did she use so many? :)
She wants to show she is happy talking and getting to know you
She wants to keep things light.
She is shy so she wants to___ comment below
She likes you, it is like a girl flipping her hair around you
She is trying to hide her true feelings
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What do a lot of smile emojis mean from a girl?
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