That's one thing that separates her from those 30-yr-old ingénues too. She's an actor, and actors need to act because its what they want to do. It's what they live for.
There was a great TV Guide interview with Bill Bixby when he was in one of his short-lived series, I think it was The Magician
. The final words were Bixby's: "God, I love to act."