Although almost any centerfire rifle round will open a can just fine.
Just use an old P-38.
P-51 is bigger. Would that be easier on her?
Well would you like to go smaller instead?
My wife is a big fan of the kind that cuts from the side, so that there isn't a sharp edge. We have a hand crank version, but I know there are electric versions out there if you, or the intended recipient, prefer.