Load that gun with .38 Special ammo and take her to the range. That gun should really help soak up recoil and be easy to shoot.
If she doesn't like it, then clean it up and try to sell it. You will get more selling it out right rather than trading it.
As far as value, it's a Taurus and they aren't exactly know for holding a lot of worth. In is market, how knows though.
I really don't think that putting 50 rounds through it will effect it's resale vale a whole bunch. Shooting it may cost you a little bit, but it also may save you a lot.
"He who laughs last, laughs dead." Homer Simpson