Valentine's day OMG...is it my fault?

I was at my desk this morning, vday, organizing my hw. This girl i barely know gave my friend a little baggie. Then, she put a baggie on my desk and starting scrounging around her bag. It was glittery pink, much prettier than my friend's. I was sooo confused, but as a polite person would do, i said, "Thank you" Then she grabbed the baggie off my desk and left the clroom. I was mortified, but my friend was laughing. Than, later, she gave every girl in my cl except for me and three girls a baggie full of sweets. Is the OMG my fault, and the absence of bag? Was she being rude?