After my wife almost got carjacked by two teenage thugs (Who would, probably, done worse if they'd been successful in getting in the car with her.) she went into both mild shock and panic. She insisted I go to the safe and let her choose a pistol. Problem is that nothing really seemed to be either simple enough or sized proportionally for her small hands.
I, also, had the problem of being her husband; and she wasn't going to listen to me in the same (awe-inspired) way as most of my new pistol students.
So, I took her to visit a highly regarded local gunsmith (Who happened to be a very good friend of mine; and he knew how to read my reactions, 'like a book'.)
The gunsmith took out an assortment of different pistols. I made facial expressions and gave hand signals behind her back; and little by little the two of us steered my wife into choosing a very sensible Ruger SP-101. I insisted that this revolver should have a 3 inch barrel and an exposed hammer spur. (Experienced pistoleros will know, 'Why'.)
Then we got rid of the undersized, very slippery, factory grips and added a soft rubber Hogue Monogrip which turned out to fit her hand very well. Finally, I paid an extra $75.00 to have the action polished and stoned. Does my wife realize that this is a great little gun? Nope, of course she doesn't; but what she does do is to shoot it very well. I've trained her to shoot double-action; but she, also has the option of going single action on the longer shots.
I let her begin practice sessions using 38 Special; and, as she gets into it, I'll switch her to full-house 357 Magnum loads. She's at the point, now, where it truly doesn't matter what's loaded in the gun. She will shoot well, regardless of caliber; and I'm happy to say that she really listened to me while we were on the firing line; and, consequently, most of her shooting is done double-action. (Which pleases me no end!)