She's blocked me from Facebook, but still tries to get my attention. Why?

[Leon]

I have never spoken to her in my life before, she has deleted and blocked me from msn, twitter and Facebook and yet she is still trying to get my attention in class. For instance, when she sits next to me she will steal side glances of me and then she will talk really loud to her friend and be showing off and then she will quickly look at me after. She keeps walking past all my classes too and when she gets to the door she walks slower and looks in at me. Why is she acting like this if she hates me enough to block me from Facebook and twitter?