I too would also consider a Colt 38 D frame revolver such as the Detective Special. Same size gun but 6 shots instead of 5.
Also, I didn't see mentioned a .327 Federal Magnum SP101. It's no longer made with the 3 inch barrel bolt it is being produced with a 4 inch barrel. It has the advantage of a 6 round cylinder as opposed to that of the 5 shot 38/357 version. It will handle several different 32 caliber rounds. You could start your wife off shooting the lesser powered rounds and eventually work her up to the 32 H&R or the 32 Fed Mag.
Also, at one time, Ruger did chamber the SP101 in 9mm as well.