You need to be more careful. Smash the car up as you wish, but don't write 'Cheat' and things as you're asking to be nicked. Just smash it up and then claim you had nothing to do with it. All you have done here is cause her little aggro' in removing the chalk, and you're probably worse off being arrested. Do it properly, and don't make it obvious it's you, if you want to do these things.

Benni.