Sorry for your loss. As I understand it, there are Lojack systems out there for your computer, but they need to be installed prior to your computer getting lost/stolen/covered with peanut butter. Having said that, its possible the Rozzers might catch your Macnapper, but without data on the computer proving its yours (or it literally being branded on the cover with her name); its difficult to prove its yours.
You wrote down your serial number prior, right?