What does this mean from a girls perspective?

Lately, there’s been a girl at my school who always waves at me. I’ve never seen her before, until now and I’ve never interacted with her. Of course, I wave back. I’m not sure, if she’s just being polite or if there’s something more. I don’t see her waving to my friends though. What does this mean?

What does this mean from a girls perspective?
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