Is she typical or atypical of the kids having issues? My bet is the kids having issues are ones that were less academically inclined. Perhaps they were misled throughout primary education (trophies for everyone, equality of results rather than opportunity, dumbed down mathematics, skipping physics as a req., etc.)
I don’t think kids like yours are having issues but rather kids who didn’t apply themselves academically.
Basically A or even B grades cannot be an average grade. C or 2.0 would be the expected average but of course this hasn’t been close to true since GWB introduced his idiotic policy.
It’s no secret, if you let kids (or people) slack, 80 to 90% will slack off. 10 to 20% will endure out of principle or habit.