Marshall was a trip! I'd say the odds are good that she's got ADHD -- or something like it. You can "see" her mind working in overdrive every second that her eyes are open. And it's nearly impossible for her to sit still, even when she's thoroughly engrossed in the music -- sung by herself or one of her colleagues.

Here, she's reading a paragraph or two from her newly released book, "Goodbye, Little Rock and Roller"
...which she followed with a related song that she wrote.