Ah the safety of anonymous internet confessions. Though I've never heard of it, does sound like some sort of college prank.
My question is, will doing this help the girl realize what she is doing that literally [censored] you off? If not, what has been accomplished?
My feeling, if you're not going to confront her with your issues with her parking practices, or call it in, just let it go. Another option if it really bothers you, as it seems it does, might be to tell the apartment complex manager.