Like you said get her what she wants first - but I like your idea of a revolver for her as an alternative defensive weapon. I also agree with your approach - don't have to clear them, etc.
I would probably not go with a 2" because even in my hands, I find they jump quite a bit. I think I would try and steer her toward a good S&W 4" in .357 mag - and she can shoot .38's or .357 mag in it ( whatever she wants ). I would try and find a good used one / model 19 or 66 something like that in a K frame that will probably fit her hands better - but if she likes an N frame better, than go with a model 27 or 28. I think you'll find a lot of options out there in the $500 - $750 price range.
I've taught a number of my granddaughters to shoot / and wives of quite a few friends - and a lot of them gravitate toward the 4" revolvers (the balance seems right to them) - and they get comfortable with the operation very quickly. I usually start them on the same revolver, 4" or 6" in .22lr, but they move quickly to shooting a .38 or .357 mag. But when they go to a bigger caliber - they don't seem to like the same gun in a 6" barrel ( it feels like too much gun to them ). None of them seem to care for a 1911 in a full size, 5" barrel, even if its chambered in 9mm ( one granddaughter is an athlete and a tom boy and even at 13 she likes a .45 acp....but she's unique). The semi-auto they all seem gravitate to is a Kimber Tactical Pro model I have, 1911, 4" barrel, alloy frame in 9mm. It seems to fit their hands better in terms of width especially. They like the grip and the controls on a 1911 ( and that might be me pushing it, because its my favorite as well ). I have a couple Sig 239's as well in 9mm and .40 - and the Sigs are kind of split 50/50 among most of the ladies - but most of them don't like the triggers ( length of reset in smaller hands, etc ). I have Sig 226's in 9mm and .40 - and none of the ladies care for them ( too heavy, too wide, double stacks, etc ).
On the revolvers - I teach all the ladies a technique of cocking the hammer with their weak hand - fire it single action / and almost universally, they seem to like it. None of them are too accurate with a revolver double action / the Single Action technique is the same I was taught as a kid of 6 or 7 shooting a full sized revolver when my hands were small ( and I still do it today as a habit ). Its a hair slower - but its damn accurate... Good luck - and have fun with the search.