Very Quiet Girl Behaviour?

I know this girl from a group who seems to be the very quiet type, more so than your average quiet girl.

Most of the time, I would see her using her phone while listening to our conversations.

Whenever I do talk to her, we would have our back-and-forth convo and I could sense when she wants to ask something outside of the convo, so I would pause for a few seconds after ending my sentence and look elsewhere, and then she would ask me something.

I don't think she is a very shy person otherwise she wouldn't try to catch my attention in a fun way by waving her hand in front of my face when I was paying attention to something else. This was when she happened to walk past me.

The real question I have is:

I am so used to girls who slowly become more comfortable and become more of themselves. But with her, I can't tell if I am making her feel overwhelmed with my level of energy/interaction (I am an ambivert) and therefore I have to lower my interaction with her or if this is just natural very quiet girl behaviour?

Very Quiet Girl Behaviour?
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