S&W made the Model 14 Target Masterpiece in a single action only variant, I am not aware of, and the Standard Catalog of S&W does not list a single action Model 17.
S&W currently makes the Model 17 classic, Model 18 classic, Model 617 & Model 63. All are double action/single action.
S&W has made runs of double action only guns for police departments and you will sometimes find guns that have been modified by a gunsmith to shoot double action only. This is not uncommon with PPC revolvers, but I've never seen it done to a rimfire.
Best bet would be to get her to handle a few guns and decide for herself. The 5 inch model 63 may appeal to her, as it is a J frame and thus suited to smaller hands. The lack of a full length underlug may make it more comfortable to hold outstretched. If she feels comfortable about holding the gun and reaching the controls she may be more willing to shoot a gun with a double action capability, even if she shoots it in single action mode. Otherwise it's Single actions with a loading gate, such as the Ruger Single Six.