Interesting, A-M. I think I'm much like your wife. I am perfectly fine staying at home, and I am an introvert. I like my home, it's quite comfortable, and I'm completely relaxed here. My wife is an extrovert, and if she stays at home too long, she feels claustrophobic; or, she can't just sit back, she always sees something else around the house that needs to be done.
I try to make an effort to plan things away from home to help relieve that stress for her, but I have to make a conscious effort to do so.
It might help you to understand your wife better if you read through the blog
The Introvert's Corner | Psychology Today. Introverts aren't broken, we are self-contained.