How shy girl behave around the guy they like?

This girl knows im a shy guy, and sometimes she stares at me a lot when I’m not looking. When I’m close to her she completely ignore me. She sits in front of the class and her friend beside her always turn around to look at me. I try to approach her two times but she start looking at the ground while smiling and blushing and doesn't even respond to me. We have a mutual friend and she always try to include her in a conversation with me.
How shy girl behave around the guy they like?
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