I think she's happy doing shows like this. This is her life: one album per year/two years, 2 or 3 singles per year and 1 or 2 dvd with her lives + a lot of voice roles. She's really doing a lot of things and she's giving her best.
I watched live Circus, live Grace Opus II, live Grace, live Flight, etc. and she is really happy when she's performing. She loves her fan - I see it in her attitude, behavior and mimicry. And she loves when people love her (I like to be admired too for my hard work)