Seems to me lotsa men want their wife/girlfriend to carry a gun much more than the wife/girlfriend wants to carry a gun.

If she shoots, takes a class and gets her carry permit just for you there's nothing gained except someone now carries a gun who doesn't want to and won't or can't or has no intention of using it.

I would no more suggest a type or style or caliber of gun for my wife than I would tell her what bra to buy. It's a pretty personal decision.