Send those small women out to a ladies clay shoot some time, they'll find her a gun and she'll find some friends. And, whatever you do, don't try to teach your wives how to shoot. That endeavor keeps counselors and homicide detectives in business.
Meanwhile, get a short barreled 20 gauge "coach gun" side by side for her to have in the bedroom. Kick will be irrelevent under the stress of saving her own life and it will require 25% of the accuracy skills of the carbine at worst.
My petite wife gets mad if someone hands her anything but a 12 gauge.