Having trained a wife, a couple of daughters, and a bunch of other women while teaching a ladies pistol class, I can tell you without doubt that women are: (1) easier to train as they do not arrive with pre-conceived notions of how to shoot from having watched too many action movies; (2) not nearly as concerned about make, model and type of action as men - women preferring instead the feel and comfort of the weapon; (3) not at all worried about things that men get all hot and bothered about, such as "cocked and locked," striker-fired pistols with short, light triggers without external safeties, etc. - mainly because no one has ever suggested there is any reason to be concerned about such things; (4) not likely to want to switch from one gun to another because they saw it in a movie, saw it on a forum, or in a magazine.
I have had uniformly good results setting a "power floor" (i.e. 9mm in autos and 38 Special in revolvers), after which I give a brief explanation that most gun accidents occur during "administrative handling." I explain that "thinking" a gun is unloaded is different than a gun actually being unloaded, and that accidents occur when new shooters think the gun is unloaded and it is not. I then show them that with both revolver and auto, there are two steps to unload. Revolver is open cylinder and eject cartridges from charge holes. Auto is remove magazine and then eject any round from the chamber. Two steps for both, and the auto MUST occur in that order. It always seems that the "light goes on" when they understand WHY the magazine MUST come out first. Easy to remember. Two steps each.
Finally, they shoot the following: M&P in 9 and .40, Glock in 9 and .40, J frame 642, S&W K frame 10 or 64, Colt 1911 in .45 ACP, Browning HP, and maybe some others. I have been doing this long enough that Colt revolvers used to be in this mix (Detective Special and Agent, DS-II, etc.) and before Glock and M&Ps existed.
I have not had any woman select a revolver of any make or description in well over 20 years of this type of process. I always ask what made the decision. Uniformly, it is that the pistol felt better in the hand, had less perceived recoil and a better trigger.
Since Glocks have been in the mix, I have never had a woman select anything else until M&Ps came along. Now, Glocks and M&Ps get the nod, Glock slightly more often because women seem to have heard of Glock. Caliber selection is uniformly 9mm.
The process that goes on in this process is fascinating, and without doubt, the husbands and boyfriends uniformly select what THEY want or what THEY want their wife to carry, and it almost never matches the wife's or girlfriend's selection.
As to the complexity of an auto - well Glock and M&P work like revolvers - they are safe if dropped and they FIRE when you pull the trigger. Given some of the people trained and certified in our police academies and schools, it is not for me to say that a girlfriend or housewife with average intelligence is too stupid to operate a simple auto like a Glock or an M&P.
Just my thoughts.
And, that said, the OP said his wife was not into autos. That being the case, I find no cause to criticize the choice of his/her Model 10/12 with 2 inch barrel. I especially like the fact that the OP has put thought into it and can explain the choice with good reasoning.
Good choice.