Your disc probably would have been better off if your wife had let it fall. But catching things you have dropped is a reflex action.
If the behaviour is to become regular, it may be good to ask her to trim her nails.
Seriously, long long ago in the days of hardly compliant suspensions I was successful a few times at re-tracking LPs that 'jumped'. But the process always left an annoying click. Admittedly better then a jump.
I surely don't get the sand paper idea, that's just insane.