I did 11 years ago, trust me the worst part was waiting the 9 months and 7 attacks to finally get the surgery.
I had 11 stones with one being the size of a robins egg (they saved it for me) the attacks were friken brutal..no I mean ######ing brutal with a capital F.
As for the surgery,It's nothing, 3 small cuts (one just above the belly button, one beside it and one just below the sternum, literally I checked in the hospital at 11am and was home at 12:45pm. I went back to work two days later and made my baby boy on the 3rd day after the surgery.
The only side-effect I can tell is I
never-ever get heartburn, I could eat nails and not feel a thing!

anything else is bullsh*t IMO. I eat everything and anything.
The gall-bladder is a useless organ much like the appendix, we don't eat things that make them work properly anymore, this is evolution at work here, in a few hundred or maybe a thousand years humans probably will be born without them.
Tell your wife she has nothing to worry about and try to get in as fast as possible and get the damn thing out.
Hope this helps.