In my never-so-humble-opinion there is no advantage to a DOA revolver that cannot be overcome with a little practice (put your thumb on the hammer as you pull it from a pocket) and a huge disadvantage to not having a SA shot available. Let us face it, snubbies are hard enough to shoot well without that handicap.
As it sounds like your lovely bride is new to firearms, she has enough to learn without adding this to her list so I would suggest the concealed hammer.
It is true that the shroud can pinch a thumb while cocking but the advantages are undeniable.
They have a cool retro look too.
In the name of full disclosure I have 2 snubs, a Detective Special and a Smith 36. The extra weight of the Colt makes it MUCH easier for me to shoot well and it is still a light gun.