She wants to get a revolver for home defense, and won't consider an auto. It will likely never be carried out of the house, except to the range.
TRAIN FIRST, BUY LATER!
It
sounds like she has no idea what she is doing, much less how to shoot, think tactically, handle the law and so on.
Discounting a semiauto is a mistake, but it is her choice. She needs to attend NRA Basic Pistol ASAP to get a proper introduction to gun safety and handguns. Very soon after, she should take a one or two day basic defensive handgun course. The problem will be finding an instructor that knows revolvers. DO NOT ATTEND TRAINING WITH A REVOLVER FROM A SEMIAUTO ONLY INSTRUCTOR! A good revolver instructor will make a huge difference in her shooting and loading technique. A semiauto instructor will not have the necessary knowledge and will treat her gun like a low capacity semiauto (I learned the hard way). Once she completes that course, she will have a good idea what she NEEDS in a handgun. Buying a handgun with only gun store commando input will result in a gun that likly does not fit her needs.
Known revolver instructors:
Grant Cunningham
Sand Burr Gun Ranch
Mas Ayoob (MAG 20 or 40...one stop shop with law and shooting)
Thunder Ranch
Gunsite
The NRA instructors and local ranges may know of competent revolver instructors.
*** Consider your mother's age and physical fitness. She may not be able to take two 10 hour days of training.
Keep in mind that the revolver needs four modifications:
1) Good sights. A plain black ramp is inadequate. Make sure the front sight has a pinned or may otherwise be easily changed. Get at least a front night sight.
2) Properly fitting grips. Grant Cunningham reviews the topic of fit in
The Gun Digest Book of the Revolver.
3) Chamferred charge holes to facilitate reloading. Stainless cylinders do not require refinishing.
4) A smooth trigger. Stacking and a gritty feel will make learning to shoot difficult.
Safariland Comp speedloaders are the best reloading solution I have found. Moon clips need protection, but are also good. HKS style loaders are inadequate, but better than nothing. Speed strips are good for a quick two round reload.
NOTE: The L Frame grip has the same dimensions as that of the K Frame. The difference is in the frame forward of the grip.