I was going to say something, but then upon reading through the thread I realized pax already said it better than I would have...
To reinforce what someone else said earlier in the thread, here's a story: When my mom and dad were first married, he taught her how to drive. About a decade later, she forgave him. Especially since you yourself are still learning how to shoot, I'd strongly recommend that you not take the role of "instructor" towards your wife, but simply go out and have fun together -- and perhaps gently direct her toward other resources, such as useful books or magazines or websites or people you've encountered, if she expresses frustration with her skills and wants to learn more. What I'm getting at is that you could both really enjoy learning this new skill together, but it's very difficult for one new shooter to teach another anything useful, and that is triply-true if the people in question happen to be married to each other.