If fudge does not "set up" and she has been making it for 150 years, she is probably not beating it enough (15 minutes minimum) or she is not cooking it long enough. Buy her a candy thermometer and/or give her a hand with the beating. After all those years, she is probably loosing strength to beat.
For an absolutely positively no fail modern fudge, there are recipes all over, on the back of choc. chip packs, on the back of marshmallow liquids-you just mix and cook in microwave. Easy and yummy too.
You are so funny, and so correct - TB - get a hold of yourself and come correct; if your wife is not the most important thing after your God...God help you.
Remember, it's God, Family, Country, State...and then whatever you wnat it to be.