Opinion as asked: The Glock 23 is about as close to perfection as you can get for a concealed carry defense gun. It is lightweight, somewhat small, powerful, has high capacity, rust proof, reliable, has a light rail, durable, simple. It is just about all the gun any person ever needs.
The standar G23 of today only requires three things out of the box: night sights, a full capacity magazine, and lots of ammo for practice.
The only drawbacks for it are: it has a very unsupported chamber so if you want to reload your own ammo, I would skip it. (Use only new factory ammo). And, it is known as one of the least accurate Glocks. If you want to make headshots at 25 meters then it is going to be a challenge. It is no challenge for my Glcok 30, or 32 or 19, but the 23 seems to be less accurate. If you are going to use the gun for what it is designed for: self defense, then who cares if it can't shoot 2" at 25 meters?
If those cons don't bother you, the G23 is just about perfection in a CCW gun.
FWIW, in that frame size, I think the Glock 32 is a better choice, in 357 SIG. Because it is WAY more accurate, and it has a far more supported chamber, making it safer. I reload for my G32. You can get 357 ammo for it cheap at
www.amoman.com.
Take a look at the G36 while you are at it. I like my G36 better than the all of them for CCW, if that matters. The thinner grip is easier to conceal and your wife might like the thinner grip as well. And it is extremely accurate.
Dry fire your Glock a lot and you will master the trigger. It just takes a little practice and soon enough you will LOVE the trigger. Some instruction on how to stack the trigger and how to work the trigger reset will make a world of difference. Next thing you know you will be hanging out at glocktalk.com and you will refuse to carry anything but a Glock.
One thing you could do would be to give much more specific details about what you want this gun to accomplish, and the experience of the shooters etc. Is your wife a new shooter? Will she be using it a lot? Is this a home defense gun? CCW gun? Car gun? Purse gun?