Cheater?

So there I was in my summer math class, taking a quiz. Then I start to feel like someone else is looking at my paper. I realized that my friend who was sitting next to me was looking at my paper and copying down my answers. She was trying to make it really subtle so I wouldn't notice, but I noticed anyways. She was good, but not good enough. She would look down at her paper, pretend to think a little, then look towards my paper like she was just thinking, and finally she'd quickly write down whatever answer she saw from my paper as if she had thought of it herself. It wasn't fair! So, obviously, I tried to cover up my paper a little, but it's hard to cover it up when you have nothing to cover it up with. I was pretty ticked off that she would actually do that. I mean, if it was just for one question that was maybe really hard, then fine. I'd brush it off. But she was practically doing it for almost every single question! Some friend she is.