Why does she not say "Hi" to me?

Hello!

So, there's this girl in my Social Studies class who doesn't say "Hi" to me.

Since the beginning of the year she has only said "Hi" to me once, but we make direct eye contact every day when she enters the Social Studies room.

I know she knows my name because she has said "Hi" to me before.

When she enters the room she always says “Hi” to my friend (In front of me) but she nevers says “HI” to me.

Why is she doing this?
Why does she not say "Hi" to me?
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