If you've got a Rossi already then get it slicked up. Even when done to "cowboy action" basic standards it's not like it rattles and falls open.
I just recently fixed up a new Rossi for the wife of a couple which are great friends. She got the cowboy shooting bug a few months back and it was a case of "into the deep end with bricks on the ankles"
Out of the box it cycled but was jumpy, a little rough and "notchy". Plus the trigger pull left much to be desired.
I'm a life long metal hobbyist that is quickly learning some gunsmithing tricks so it fell to me to slick the rifle up. I did all the things I'd done to my own Rossi over a lot of trips inside all in one go since I now had a good idea of what worked and what didn't. I didn't use Steve's information but the information I found on the web from a search for "rossi 92 action job" along with a spring kit for the Rossi let me turn her new rifle into a slick and smooth handling gun.
All in all it took me about three hours from start to finish. But I'm not a gunsmith and I'm not working in my yet to be reno'd metal shop. So things took a little longer. A proper cowboy action gunsmith should be able to slick up your wife's Rossi for the cost of the spring kit and no more than two hours worth of shop time.
What you'll get out of this is a rifle that makes your wife grin like the Cheshire Cat in Alice in Wonderland...
Note that if you cycle it moderately fast it'll do fine with .38Spl loads. If she wants to pick up the pace then you'll want to look at loading rounds up in .357Mag casings instead. The shorter Specials tend to jump up and get pinched in the works where the Magnum casings tend to feed smoothly when cycled quickly.
As for short stroking the lever there's not much to do about it other than practice. But being slicker and smoother she may not assume that when it hits one of the notchy points in the stroke that it's done. With the smoothening out the end point of the lever travel is far more easily identified.