Yeah, don't TP her house... that's just stooping to her level.
Be more creative.
Maybe, write a letter, informally addressed to her, but unsigned, on her doorstep.
Within that letter, write a story beginning with "I had this dream about you..." and in the 'dream' you describe, have her do something really weird, like clean turkey poop from a racetrack.
That way, she will just be very confused.
At the end of the letter, sign it with 3 initials, none of which are your own, and write "And I know I will dream of you again!"
Then, a week later, do the same thing.
And again.
Then, the fourth time, write nothing but "Dear [girl's name] X.X.X. (your "initials") has passed away. He wanted to give you this." Then sign it with the same last 2 initials, but a different first initial.
The "this" that you give her should be an old quarter, colored red with sharpie, and enclosed in a matchbox.
That is all you should do.