Pisces why are you so difficult?

There's a Pisces girl whom I want to get to know more during the Summer. I left her my business card taped to a piece of paper on which I added a quick note that said, "I think you're cool! We should do something during the Summer... take care (then my name), I then stapled the page in half so that no one else could see it and placed it in her box. Well, I waited to see if she took the letter & business card and clearly someone had opened the letter because the staple had been detached from it and it had been put back inside the box in a messy way. She signed out and left work and left the letter & my business card in her box. Did she forget the card by accident? or did she mean to leave it as to show me "disinterest" in it? How rude!