In these short and sweet sessions, you don't need GPS. And honestly, if you guys get lost in the empty parking lot, maybe neither of you should be driving. For that matter, since you're imparting such wisdom to your new driver, you want to be sure she can hear you, so the radio isn't necessary either. Promise that she can listen to whatever she likes -- no matter how much it makes you grind your teeth -- on the way home. And really, during these driving sessions there's no reason for her to be reaching for the console at all. You can be in charge of the heat and the A/C, the fan speed, any of that stuff in the middle of the car.
And NO CELL PHONES. Not at all. Not even plugged into the entertainment system. Not even if the robot woman who lives in your car will read the text messages to you. None of it. Non-negotiable.