Some time in the future (maybe tomorrow, maybe next year, maybe in 3 years) your computer breaks down and you need to buy a new one. Or is attacked by ransomware or is hacked and needs to be reset.
Then either you or your wife or your IT guy needs to set up everyting with all programs and all data and all settings she needs to run her family and household business, or the new computer will be useless.
So this is a good opportunity to practice this scenario. Start making an image backup (to 2 different external disks) so you can go back to it if necessary, then reinstall Windows and pretend it's a new PC (in some sense it is, but on the same hardware). Then together with your wife make it fully operational again. If it fails, note all reasons why (like: we couldn't find the MS Office disk with the license code, and had no idea what the password of our e-mail account was) go back to the image and make the necessary preparations for if it's really needed in stead of just an exercise.