Why does a girl keep staring at me? But doesn’t talk to me?

We’ve know each other for a while. She is known to be more shy and quieter I guess. I always catch her staring at me in class. But she rarely talks to me and when I do talk to her she answers short and seems somewhat interested in the conversation. Any help on what this could mean?
Why does a girl keep staring at me? But doesn’t talk to me?
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