Hi,
Grinding of the teeth causes teeth to get worn out/ attrited that is why she is getting sensitivity
Next Steps
you must take her to a local dentist and get a night guard made
a night guard is like a mould , it sits on all the teeth and protects it so that even if there is grinding...teeth dont get damaged
also buy toothpaste thermoseal RA
now though it is a toothpaste use it like a medication
take a bit apply on all the teeth...leave for 10 mins , wash it out
this will repair the damage to an extent
i hope this was helpful to you
regards,
Dr. Prachi Lalji