TBH ...I think she was better running mate material, not anymore
Whose ticket would she add anything to as a running mate? She wouldn't help with the swing state voters like Klobuchar or Brown. She wouldn't help with turning out the minority vote like Harris, Booker, or Castro. She might help turning out a few senior women with men's haircuts, pun maybe slightly intended but please don't take it as homophobia. That's about it.
Since she's from Massachusetts and thus easily replaced by anyone liberal with a pulse, she'd be useful as a Secretary of Something.