The "a revolver is best for novices and older folks" argument...
... has been around for a long, long time - but that doesn't make it inherently true.
For one thing, it really isn't that hard to learn how to operate a semi-auto; it isn't that hard to learn to clear stoppages. If a person lacks the mental capacity to figure out those basic steps, they probably also lack the ability to operate any handgun in a safe and effective manner.
For another, while the slide can be a challenge on an auto, the DA trigger can be a real challenge on a revolver.
My mother, who is pushing 70 and is beginning to suffer from weakening of her hands, got her CCW last year. I offered to let her borrow her choice of guns from my personal arsenal. I let her try to cycle the actions of several pistols, and dry-fire pistols and revolvers.
She had trouble with a GP100 and an SP101. Opening the cylinder, loading and unloading were no problem. The DA triggers were big problems - and my Rugers had Wolff upgrades.
She even had some trouble with my S&W 18 DA trigger.
So.... she eventually chose my SIG P239 DAK. She could work the 9mm slide, once I showed her how to push the frame through, instead of pull the slide back. Partly, this was because the 9mm recoil spring isn't that strong; partly, this was because the P239 has a relatively tall slide, compared to the slides on my CZ's (slide inside frame on the CZ leaves a lot less area to grab).
She had no trouble at all with the 6.5lb DAK trigger, or its pull length.
For her birthday, I bought her a gun-handling class at a range near my parents' house. I called the instructor, and asked him to focus on stoppage clearing, loading, and unloading - because Mom is a pretty good shot for a novice.
She had learned most of this stuff with me, but I felt it would help to have it reinforced by a professional, who was not her child. (I've learned over the years that it isn't always a good idea to try to teach loved ones; they will argue more with someone they know than they will with someone they have to pay.)
She has since bought a SIG Mosquito for inexpensive practice, but she makes a point of also bringing the P239 and shooting at least 25-50 rounds when she goes to the range.
Going back to my original post - you have to find a gun that fits comfortably, that shoots comfortably, and that has its controls laid out in a way that works well with the intended shooter's hands. This may very well be a revolver, but it could just as easily be a semi-auto. Best thing is to handle a variety, and find out what fits; then, find a good instructor to teach fundamental shooting and handling skills.
Don't assume that because she is older, or female, that a semi-auto is beyond her abilities.
Cheers,
M
(Proud son of a college salutatorian, brother of a university associate VP, and mate to a former pro rider/trainer and soon to be RN - don't sell the women short, guys.)