Girl answers some of my questions but ignores others??

I've been talking to this girl I know from school for a couple of weeks on Facebook through messaging. Some of my questions she replies with full sentences but others she ignores completely... This goes back and forth she will ignore some then reply to one then ignore one.

She has read it Facebook marked them as "seen on" then it gives a date. Is she just bored with what I'm talking about or what? I'm confused...
Girl answers some of my questions but ignores others??
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