You would need to see a well qualified Homeopath to work out a constitutional prescription to resolve your wifes entire health problems of which kidney stones are just a symptom

However in my humble experience as a layman i have found that Berberis Tincture (10 drops in a small glass of water taken 3 times a day )successfully resolves and clears Kidney stones and gallstones

Do not take for longer than 14 days but usually it will only take 3 to 5 days to clear kidney stones

This will give you breathing space to find a good homeopath