She’s getting her face back in politics. She safely chose one of the lowest fellow democrats to attack and did it on a personal level. She didn’t have to get involved with political dogma or offend many fellow democrats.
Presently she & daughter are in Portland (Moscow on the Willamette) for a book tour
Agree, and commented similar below before seeing yours. You are on the right track in my view. Hillary would look bad going after a front-runner, so she picks on someone in the public eye but not a threat for the nomination.