All of the location methods I can think of require a decent amount of skill to set up and operate.
The problem is that GPS is just a receiving system. A GPS unit is nothing more then a glorified radio.
It's very easy to set up a system that will tell the driver where they are, but if you want another person to know where you are, you need some sort of transmitting device to send your GPS data to whoever is tracking you.
Copilot live allows you to track vehicles, but she would have to have a laptop in the car, running copilot, and a cell phone connected to it, and the internet.
I'd look into stolen vehicle recovery systems, as well as something like OnStar.
Or you could just teach her to read a map. A brand new road atlas and a promise from her to use it would be your cheapest way out.