In my experience, it depends on the weight of mainspring you put in. YMMV
IIRC, I used the lightest in the 3pack spring kit in my Taurus 605 and it was 'click' central. Trigger felt darn nice in DA, but a 30% failure rate was unacceptable.
Changed out the spring to the middle one in the Taurus pack, and it's been flawless.
Trigger return spring is a boar to put back in and only marginally helps, IMHO so leave that one stock.
Another thing I like to do w/all my revos is to give them a good thorough cleaning, and then lube with something slickery like Weaponshield or MPro 7 Lube or even CLP.
Then I dry fire the pee out of them. Literally doing 50 rounds a session over the next few days, and hashmarking every 50 until I've hit 1,000 dryfires.
I don't use snapcaps in my Taurii, as they're lifetime warrantied and I am not concerned about mashing any springs. Again, YMMV, so if you sleep better at night by using snapcaps, then I recommend them.
Do a GOOD detail clean and lube and 1,000 dryfires and change the spring out as a 2nd step if your wife still has issue. *Remember the power of the 'placebo effect' and make sure you tell her you found some good interwebz voodoo that you did to the gun that will make it just perfect - I'll wager she comes out happy.
Good luck.