Ok ... You are not gonna like what I have to say but after watching this play out oh ... I dunno, like a bazillion or so times over the years here is what I have learned. Take your wife to the range and let her rent as many different guns as it takes. Then, when SHE finds the one she wants do not argue with her, do not try to talk her into what YOU think is the best gun for her, simply ask the salesman to go get a NIB version of the gun she picked so you can buy it. Oh ... And don't forget to get her several boxes of practice ammo while you are there!! Oh and a good holster.
Have fun at the range!
Eta: My husband taught me to shoot. @Snake Lol We did great until I got good enough that I didn't need him to tell me how to gun a stage. But habits were in place by then and I could be seen at any given stage at OKCGC giving him the stink-eye because he would NOT SHUT UP while I was trying to get ready for my turn to shoot. Lol He stepped back and I took lessons from one of the better shooters in our group of buddies for a while after that. (One of the great benefits of working at the gun range. I got to hang out and play around with some really good shooters who didn't mind letting me play along. Haha) Grumpy got razzed a little for that but like any really good husband would he took it in stride.
I saw so many men whose egos were absolutely destroyed by their wife not "falling in line" when it came to taking shooting advice from them as gospel. Not saying you are that way -- just that it is amazing how many men are ...
I've had two WISE instructors tell me not to "train" your wife after a certain point, let someone else do it. If you want to stay married that is.....
Which is exactly what we did lol. I could tell her the same thing 10 times and get an argument and an instructor would tell her the same thing once and she'd be like "Oh that makes sense."