Buy her a gun. Take her out to look at a bunch, find one she likes that fits her, and buy it. It's her gun.
Seriously. We spend just tons of money on guns, mags, holsters, hear, etc. Our competition guns cost $1500 - $3000, we have $800 reloading setups, and we go through $100 of ammo a week (easy).
A $600 gun for your spouse is nothing in comparison, and she'll enjoy shooting more than if she's always shooting "your stuff."
Shooting informally without other people focussed on her is probably a good idea too, until she is more confident.
-z