What she meant by doing this?

This afternoon at school after diner we were back in class and when i arrived at my place i saw that my pencil case wasn't on my desk (i leave it on the desk b4 lunch) so i went to my locker thinking that i may have forgetting it here, n when i go back in class the Pencil case was on my desk again… this girl hid it for making me a joke lol.. why she did this, is it flirting, this girl has been teasing me a few Times previously too?

What she meant by doing this?
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