There is a two step program depending on your budget of course. :-)

Step one, that's the cheap one btw; get yourself the H-SPORT sway bar kit for the car. It changes the front and rear sway bars to bigger diameter ones and the rear as a two position setting. Of course I will suggest you use the stiffer position to help "rotate" the car better. IIRC the kit is less than $450.

Step two, is the more expensive proposition. It can be divided into three sub categories, again depending on your budget but the phone call to STaSIS is free! Your car's handling will improve noticeably.

Step 2a... Get the STaSIS/Ohlins SL coilover kit for your car. World famous Ohlins shocks in a properly tuned coilover kit but for those on a budget (~$2000). Just adjustable in height with none of the fancier bound and rebound adjustments provided on their other top of the line kit.

Step 2b... Step up to the plate and get the STaSIS/Ohlins MS or Motorsport kit. Not for the faint of heart for sure with its ~$4000 price but I can assure you the best suspension out there for your Audi. Not only height adjustable like every coilover kit but the rear shocks are adjustable one way while the fronts are adjustable two ways with external reservoirs. Also the shock housing is made of light weight aluminium.

Step 2c... You can supplement the car's handling towards even more oversteer by adding only the rear sway bar from H-Sport. STaSIS will sale you only the rear bar as part of the SL and MS kits if you want.

Now the bad news is, I don't think anyone here as a cure for your wife dilemma! May I suggest you hide the keys from her. :-)

Quarter mile in 13.3 seconds at 107.3 MPH!