WOW ! Pretty esoteric analysis of power supplies, GFCI’s etc. etc. Did anyone suggest to check Charles Dalziels research work on electrocutions in human adults ?

May I respectfully suggest, that you suggest that she find something else to do in the tub …
If that dosen’t work help her maximize the computer time. Build her a platform for the car. Something that sits on the dash perhaps in front of the windshield then she can get more computer time in while driving.