I agree with TC, if you're interested in auto-x take an auto-x school such as Evolution. If you're interested in road racing take a road racing school such as Barber or get involved with your local tracks HPDE program. They're both very different skill sets. My wife and I have taken Barber and Evolution together and got a lot out of both schools. Be prepared for your wife to eventually kick your butt on the auto-x
women tend to be more detail oriented than we are, auto-x is all about the little details and minimizing the mistakes.
This is the MOST important advice I can give you in regards to your wife getting involved. Do NOT give her driving advice unless she asks for it and even then be careful how you deliver it. This will promote domestic bliss.