for the hell of it.......I would switch the cold and hot water hoses, or the wires on the valve.....
hot wash and rinse.......most people don't even pay attention once they load and go.....
outside the fact, she may notice her clothes becoming cleaner......must be the newly fixed agitator!
then again, she may figure you don't know what the hell your doing, and never bother you again.....
win win.....or lesser of the two evils....
recalls a story from long ago, had a pesky neighbor who, for what ever reason, at least twice a week, unplugged his TV, to which he bugged the hell out of me to re-program the channels every time......after about two months of this, I super glued the plug into the outlet.....