For what it's worth, the CZ-75, Jericho 941, and the EAA Witness (at last in 9mm) are pretty easy to work despite the fact that there's less slide to actually grip. I know this because my mother, who has weak hands, can rack both of the CZ-75Bs, the Jericho 941, and the 9mm Witness in our house. She has trouble with the 10mm Witness, but in fairness, even I think the recoil spring is pretty stiff in that one.
Technique has a lot to do with it, too. There are several different ways one can rack the slide on a semi-auto handgun and some of them are easier than others. If you're sure she's using the best technique for her and she's still having trouble, then you're right, it's time to change equipment.
Sounds like it worked out for both of you in the end. Get that Dillon going, make some ammo, and get the missus some trigger time with her new sidearm.