What's your wife's level of proficiency with pistols? Is she an experienced shooter? Has she given any input into what she wants or how she plans to carry?
If not, getting the smallest and lightest pistol generally isn't a great idea, especially if you ever want her to train with it.
She's a very good shooter. She just wants a lighter weight carry gun. She has shot my son's Browning 1911 .380 Black Label and was fine with the .380 as in accuracy etc., but didn't like the safety grip on his 1911. She'll train a lot. We have some ranges built where we live so all will be good.