If it's the frets which are deaf this is a job for a luthier*, I'm afraid. With any luck a tweak of the truss rod can help but you may need a full re-fret and set up. The same symptoms can occur if your fingering's inaccurate muffling (or more correctly "muthling") the strings.

I have to say it sounds pretty bad if she's not allowed home because of it.

*Be very careful not to take it to a loofah.