Maybe you guys are looking at this the wrong way. How do we know she "expected" you to switch seats? She probably knew it was a huge long shot but ya never know if you don't ask.
If I was ever traveling with my sweet, cute innocent looking wife and only one of us got an upgrade I'd probably have her try to pull the same thing. Of course, I know it would almost never work but it'd be worth it for the one time it does.
