Mike, I would have her drive her car as it is the one she wants to learn to drive better.
Tracks are often quite intimidating to even the most experienced street drivers, and being comfortable with the car helps get over this more quickly.
I'm sure she will do fine, and not cause any issues with proper instruction.
IMHO track awarness(flaggers, passing, etc.) is primarily the instructors responsibility in a novice group. The student has way to much new information coming in to handle that additional load. Learning track awarness is part of being a novice....
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