That's a sweet ole gal and I would not have her waste her money with a gun smith.
Simply put, the only usual issue with these marvels of yesteryear is they are dry and dirty. Old oils of its time do not match the science of today or quality of those old guns and actually dry up and harden to the point of impeding operation and accelerating wear. The simple action to take does not need a gunsmith. Just one of the premium modern gun products from any sporting goods, gun store or hardware store.
Most are both cleaning and preserving agents; Breakfree, Kroil & M-pro7 are some of the best, but there are others. Disassembly is not necessary. With a spray can version of the product, flood and flush the revolver thru every opening and crevice until the black gunk stops flowing out, let it drain for an hour and wipe it down good.
Definitely with grips off: Loosen the grip screw completely and carefully push down on the screw head until the bottom grip separates, then remove. Now push the top side grip off with a finger or toothbrush from the backside thru the grip frame. Scrub barrel bore and cylinder chambers with a simple cleaning rod kit found at the same places as the cleaning agents above, and patches cut from rags is all you really need. And scrub any observed exterior and crevice crud with an old toothbrush with bristles cut off short for stiffness.
Then I'm sure you can tell if it's functioning correctly when you cycle it. Once cleaned and lubricated, with a few simple checks you can determine it's safe to use. Cock the hammer slowly and confirm the cylinder is locked in position for each of the 6 chambers. If satisfactory, now operate the gun by pulling the trigger slowly until the hammer drops. Again, confirm each time after cycling the action, that the cyl is still locked in position. Cock the hammer in single action mode. Gently push on the hammer to confirm that it will not drop w/o pulling the trigger.
She can shoot it to her hearts delight, and it will delight her with its fine accuracy, and comfortable recoil.