Overthinking overthinking

quote from my book, same one appearing in the body of the post.

ADHD is a different brain wiring causing ADDED distractions, imagination, stress, hyperfocus, energy, despair, sensitivity, innovation...

“Are you still thinking?” 
“Always,” said Kay. Though she wasn’t quite sure what it was she was thinking about. There was so much to think about, so much to marvel at, everything equally urgent and important. Or maybe not, but each new thought burst in forcefully, trying to kill all others and reign briefly, violently failing. She wondered if thinking might constitute strange behavior, too. Maybe just overthinking. Could one overthink overthinking?