Sounds more like your wife's driving style IMHO..however good luck with that one
Never had any issues no matter how hard I drive it. Also never mangaged to get it to slide except in snow.
Often on roundabouts there may be some diesel spill from buses, they are prone to filling them till they overflow I noticed, There is a corner near me that has caught a few drivers unaware and the theory amongst locals is it could be down to diesel spill.
In any case get her signed up for next years Monte Carlo..starts from Paisley I think