If your car isnt brandnew or a Mercedes: Simply get yourself something to read, so you dont need to focus on the traffic, when she drives. Thats the way I do it. My partner had no crash until now (only typical minor parking damage), but according to physics he keeps not enough distance to the driver before him. The problem is, there are hardly any people having enough distance, so he simply drives "normal", as everyone else. I cant make my brain stop, to calculate the reaction distance, according to the driving speed, which tells me all the time, that if whyever the car before us did a really emergency break, we will be in it, and the car behind us as well, because of it having as well to less distance... I read now. I can discuss and argue around with my partner for this the next 70 year and create a bad time for us everytime he drives, or I can read.
Edit: Really whondering how insurance works in your country. If I let someone drive my car, that has a legal driving license, in case that this person has no own car and so no own car insurance, the damage will be payed by my insurance. If the person has an own car and so a car insurance, then he must pay the damage himself.