I have mixed feelings about grades. When applied properly, grades are a reasonable measurement of a student's ability and motivation. When applied otherwise, grades can be arbitrary, and at worst, reflect only one limited abilities (e.g., memorization).
On the other hand, high grades open up doors that would otherwise be closed, such as more opportunities, advanced classes, and control over your educational life.
Ideally, we wouldn't need grades. But since we're stuck with them, I recommend trying to make the best of it. Your daughter's iconoclastic attitude may be very helpful later in life, so long as she remains humble.
