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IMO her penchant for tank-tops at her non-spring chicken age among suited colleagues is a tell-tail sign and fits in quite neatly to your theory.
She looks sillier and sillier and kookier and kookier as she tries this party-leaving move to avoid a primary and thus keep her Senate seat, but it's way too late as she's below water in approval ratings with republicans and independents, and way below water among Democrats who mostly despise how she personally torpedoed the Biden agenda (and her own base) time and time again, once with a thumbs down, look-at-me move in the well of the Senate.
Ya can't get anymore narcissistically silly than that.