Is this girl teasing me?

There is a girl in my school whose a year below me, she is very pretty and I DM her during the summer that I wanted to get to know her better and she was really dry and the conversation didn't go anywhere. Now, whenever I walk past her in the hallways she always stares at me and sometimes she rolls her eyes. Recently I've noticed she pulls her panties up a little bit from her jeans so her panty line is more visible when I'm closeby. What does this behaviour mean?

Is this girl teasing me?
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