Why do girls decide to hate other girls for no reason?

There's this girl who goes to my church. I've been nothing but friendly to her and I'm always complimenting her clothing and style. She NEVER compliments me. She will compliment my friends right in front of me and say 'you look gorgeous today Nia' to my friend and completely ignore me.
On another occasion, she got my church photo and I didn't want anyone to see it and she kept taking it off me and smirking
i sent her a Facebook friend request and it's still pending a year later (basically she ignored it) and she has accepted everyone else at church as her friend

whats her issue with me? Why has she decided to dislike me for no reason?
Why do girls decide to hate other girls for no reason?
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