Only if she had the GPS turned on and tracking her way in in the first place with her vehicle marked as a waypoint. 99% of GPS users probably don't have a clue how to enter coordinates from a map, either. Without a waypoint punched in, a GPS just basically shows "You Are Here".
Yet (and I know you're not arguing the point), 15 minutes with the "get started" section of the manual would alleviate this problem. And a lot of the simpler units have fairly clearly marked "waypoint" and "goto waypoint" buttons. You don't even have to navigate a menu. Again, I'm not promoting GPS as magical tech that will get someone home. If you use one, at least know the very simple basics. At some point personal responsibility has to come into play. It's unfair for someone to put people like Avenger at risk because they never used their GPS, got lost, turned it on, and said, "Hello Mr GPS, please guide me back to my car" and found out it's not a magic hand-holding device.