Use her upgrade to get her one. Trust me, signing your girlfriend up for Google Latitude
is like stalker heaven. Android phones update your location every 30-60mins without even having Maps open.
I tell my girlfriend I have her on it in case she gets kidnapped so I can find her and rescue her. Or if she loses the phone we can ping it. It makes that pill a lot easier to swallow.
I am not the jealous controlling type, but it feels good to know you can see exactly where they are on a whim. You know, to save them from kidnappers