A Woman in Law School

I sit by the same person in all my classes. She is a good friend and study partner which I believe to be rare. (It usually seems like they're either good friends or good people to ask questions to, but not both.) The problem I've had lately is that she always watches my screen. So if I have my e-mail up she is right there reading it too. If I check for celebrity gossip during slow classroom discussions, she is right there reading along with me. It bothers me. And it bothers me for more than the obvious "she's nosy" reason. If she is watching my damn screen all day and professors look up, they see not only me looking at a screen but also her. And you can tell she isn't taking notes.

So in lieu of asking her to stop I plan on purchasing a security screen blocker. I figure it will send the message well anyway.

Does anyone have one of these? How well do they work? I've heard they aren't cheap, but I figure it could come in handy for reasons other than Nosy Nancy.