How do I copy a user profile between Macs?

I have an Mac Pro running Lion, my wife has a Macbook Air also running Lion. We have the same apps installed. I want to steal my wife's Macbook while I'm out of town on business. To do so, I'll have to bribe her, but I'll also need to give her a seamless experience using the Mac Pro for the week. How can I easily copy her profile, including all settings, mail, and documents, over to my Mac Pro so she can use it, and then send it all back to her Macbook when I get back? I know there's a migration wizard, but neither of these is a new machine, and I only want to copy one profile (hers).