There are a lot of them, Cue.
If your wife is more interested in hidden object scenes than she is in a whole lot of puzzles, I would suggest the original Phantasmat (the first game - there are many sequels) and Enigmatis: The Ghosts of Maple Creek. Older games now, but goodies. They are both what I would call spooky games, though, so if that isn't to her liking, I am sure that we can come up with other suggestions.