I never let my wife drive my car
Is there a reason why you do not want her to drive?
She is a terrible driver she has a phobia of break failure
It is ok to not let your wife drive your car. If she is scared you can talk her to a driver school to help teach her skills.
I want to teach her to not be so nervous. She never drives in the country lanes when she is scared.
Maybe she just feels safer with you driving the car. You should not expect her to be comfortable driving your car.