[Tim7139]

We have 3 dozen posts here but the root of the problem is simply not equipment. These are all high power, lightweight cars....this we know.
You, or somebody else needs to get the Mrs. Out in a big, non scary environment, like a parking lot and spend a fair bit of time until she comes to terms wth pedal modulation. Barring that you're options are likely two.....another car, or she hurts herself or somebody else.
This is the same stuff as folks going to school to learn threshold braking, wet pavement counter steering, etc., etc.