I read your other post, so I won't recommend a revolver.
I would recommend renting or borrowing several guns for her to try. For one thing, the slide on a "broken-in" gun might be a little easier to manipulate. Recoil springs do soften (a little). And slide rails do smooth out (a little). So a gun with some rounds through it might work better for her. Plus, you might find one she can manipulate whether it's new or not.
of the technique others have mentioned. The lady in the video is pretty small.
Regarding the .22, I'd hang onto it if possible. A .22 is a good thing to have in your collection. It makes for cheap practice. You can send it back to Taurus to clear up the malfunction problems.
If you do sell it, you'll lose money trading or selling through a dealer. Most states don't have registration, so legal liability for selling a gun to an individual probably isn't an issue. But it's also understandable that you might not want to sell a gun to a stranger out of a personal sense of responsibility. You might want to look at the Buy/Sell/Trade forum on this site, or find a firearms forum that is specific to your area. Once you "get to know" people on any forum, you might not have the same qualms about selling to them.
Good luck, and be sure to post a range report about your wife's new gun!