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I think it really comes down to how well the Glock fits your wife's hands. I own a G19 and a G23 and have shot many G26 and G27s. I personally do not perceive a big difference in recoil between the compact and subcompact version of each but they fit my hands well. Renting and shooting is the best thing you could do for your wife. Let her find something that fits the hand well then worry about size. My wife loves my G19 and it fits her hand well. She tried the G26 and did notice a difference in recoil but not enough to make a difference. The real issue for my wife was the strength of the recoil spring. She had a very difficult time operating the slide on the G26 but has no problem with the G19.

I echo the comments above on the S&W M&P. That might be a better option. Either way, try a G26 with the finger extension and see what she thinks.

My .02