When a girl takes all my jokes seriously?

So this girl and I talk and joke a lot. The thing is that when I make a comment or something that is meant to be an obvious joke, she takes it seriously and responds as if it was a serious comment. she'll say things like "you are weird" or "you are conceited" or give me some smartass answer. when I tell her I'm just joking she will say "i know, that doesn't mean I have to laugh" and then she'll smile and look away. she will laugh at the lamest jokes other people make (even fake laugh) but not.at mine. does she just dislike me?
When a girl takes all my jokes seriously?
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