Craig: go to Wolfe Springs in Ardmore, PA and get your springs there. They have 3 sets available for the j frame revolvers: factory replacement, combat (I believe) and target. I bought all three sets and found a happy medium with the target springs, I believe (iirc), and they are probably less than you would get the same thing packaged under someone else's name.
If your wife cannot pull the trigger on that revolver then get her something she can work. I had a friend who had one of the 642s and I thought it a piece of junk. 1 out of 5 factory loads would misfire, the trigger pull was obnoxious and you could not get any indication of accuracy capability with the thing on accounta it was a pita to fire. He finally dumped it.
Understand that if you want your wife to use something she has to be able to use it, and use it effectively. If you like a dao revolver then you carry it and get her what she can effectively use.