So yeah I’m listening to the high pitch as I sit in my home now. I have had this since front row of Ronnie James Dio at Swing Auditorium San Brdo 1981. Back then they put these monster 6-ft tall speakers at least 8-front of the stage and Dio was ear splitting enough without front row standing. My ears rang for almost a week and then the ringing began. At first it was a lower doorbell like tone -good times ensued- but as time has passed I’m convinced it’s the internet frequency which keeps it alive - daily. Most of the time it’s like a white noise I don’t pay attention to but at least once a week the pitch jolts me upright - like wow man that was a good one, is what I say to my wife, and it passes within 5-10 secs. It generally happens at home - although 32 months of isolation - I forget a lot. Hope this is helpful. Good luck and best advice is provide her whatever she needs when it hits. Generally an acknowledgment that she’s not bonkers should do.