My student seems angry at me?

There is a senior student in my class that was really diligent last year and she was attentive in class. This year, she doesn’t pay attention in class and doesn’t participate anymore. She also looks away and doesn’t look at me but at her computer. Once I asked her to do an exercice and give it to me after class. She didn’t do it and said „Maybe you should ask someone who is intelligent enough for it.“ and walked away. I mean what did I do wrong? It’s kind of frustrating...
My student seems angry at me?
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