The S&W M&P, the Walther P-99, and the HK P2000 all have adjustable grip sizes using different sized backstraps or grip panels. I think the Beretta Px4 does as well (?).
Any of those may be worth looking at if your fiance's ability to grip a Glock 17 is an issue.
The other option might be looking at single stack 9mm pistols, like the Sig P239, Sig P225 (if you can find one), or a 9mm 1911.
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