Why did she suddenly become rude towards me?

BiscuitesSwag
I'm kind to everyone and I have this classmate (I was kind to her too if you may think that she was an exception) that suddenly started to make mean comments towards me whenever I'm just around her (not even talking to her). I can't think of anything that I might have done to her recently or something... Do you have any idea? @.@
P. S.: I'm not trying to make a big deal out of this, I'm just curious why since I can't find a reason.
Why did she suddenly become rude towards me?
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