Worst driver ever? Gosh, at first I thought this thread would be about me!
Seriously, I'll throw my concurrence in with the other posters, Paul -- she obviously has no respect for the car. Maybe it's because she hates American cars, or understands the decline and fall of the Mustang because of her extensive study of the history of the Ford v. Chevy battles. More likely, she just doesn't give a rat's petuti. Put the 'Stang in the garage, spend $300 on a '76 Toyota Corolla that runs most of the time, and that you won't be upset about if she mashes into some gang-banger. Once she's figured out where the corners of the car live at, and how to back up without going over the curb, make her save her own cash to fix the damages to the 'Stang before you let her drive it again.
But that's just my cocky-a$$ed little opinion.
Dan