I would have to point out that I am one who has actually done some reading while driving.
The closest thing to reading I have done is looking at a map. But your point on needing to read to keep your mind alert is true. Sometimes I talk on the phone when it is lat to keep myself awake. I have heard once about a guy who was practicing his violin while driving, he got pulled over because apparently he was weaving back and forth a lot. I think he was on his way to a rehearsal or to an actual concert.
And she hasn't even started some distracting conversation yet. I wouldn't want her (probably behind the wheel of some 3 ton bigazz SUV) right behind me.
Wouldn't bother me. as long as she is staying the proper distance and paying attention to what is giong on why should I care?