Late model Charters are good guns, I've had a few. Now that I think about it, if the OP's wife is totally new to shooting and has health issues I think she might be better served with something else. A lightweight snub is still going to have some recoil and muzzle jump even with mild ammo, unless she can consistently grip it tightly a snub will probably be an exercise in frustration. The short sighting radius and minuscule sights aren't going to help her either.
Have you you considered the Ruger LCRX with 3" barrel? It comes with adjustable sights and a big comfortable grip, still weighs under 20oz. I think. It's the large print edition of the standard LCR.