I already have the perfect plan for you--all you have to do is follow it and I guarantee both your wife and rifle will both be your's happily ever-after forever. However, you may need to involve the staff at Gunwerks to pull it off, maybe a little grease under the table might help.
Make your reservations at Gunwerks for the both of you--be sure to stay at a posh lodge nearby (big plus if it's adorned with taxidermy trophies taken at long range). While you're taking lessons, have the instructor bring out the rifle you want and let you shoot it--but get an average group and express frustration openly to your wife. Offer to have her shoot it--but secretly replace the target with one you have previously shot a .25 MOA group in the bull's with. The spotter will have to purposefully feed erroneous solutions to keep the impacts off target but still call hits--after the string is done and the target is retrieved you will both be amazed at the accuracy of both the gun and her incredible marksmanship. Show extreme humility and shame and say "well, if only I had a gun like that" and baby, it's in the bag.