She never has anything to say!

I've been talking with this girl for a few weeks now.

I'm always the one making the conversation interesting and fun. When I talk about random things that stimulate conversation she responds and laughs and giggles and talks a little back about the subject.

But if we're just sitting there and I'm not saying anything, her conversation is so horrible! It's about school and asking questions about class or about boring things like that. Why is she like that? Are some people just bad at conversation or is she nervous being around me?
She never has anything to say!
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