Have your wife get better muffs and better plugs, both with higher NRR ratings (both should be in the 30s, around 33 or so) and make sure they fit properly. The NRR won't mean a whole lot if the protection does not fit correctly.
If you took her to an indoor range, change that. Outdoor ranges are less noisy because they have so much LESS noise being reflected back at t shooters from the ceilings and walls. Dirt ranges often have even less because the dirt on the ground absorbs some of the sound that otherwise would be reflected back up from concrete floors.
"If you look through your scope and see your shoe, aim higher."
-- said to me by my 11 year old daughter before going out for hogs 8/13/2011