Why does she wave at me every time she sees me?

She’s a girl at my school. I’m not friends with her, I don’t know when her birthday is, I don’t have her number or anything. She was in my class last year but not this year. We’re strangers but she waves and says hi literally every single time she sees me. Every day. Every time she sees me, wth?
Updates
+1 y
She has a boyfriend, and no, we’re not gay, so why does she wave at me literally every time she sees me. Girl, I don’t even know you.
Why does she wave at me every time she sees me?
Post Opinion