This is going to sound like a tinfoil hat theory to defend her actions so lemme say she's dumb as fuck, a huge dissapointment and a certified lib.

I think her and Bernie are trying to triangulate (poorly)

It's a bunch of power seeking dems calling for biden to drop out based on horserace bullshit, nobody's actually arguing to replace him with somebody with better politics just better optics of not being the fucking crypt keeper.

I think bernie and AOC think they're being very clever by advocating for biden so that when he does eventually step down and then his replacement loses anyway they can say "can't blame us progressives for this one we were saying he should stay"

Unfourtunatly their plan boils down to getting liberals to stop blaming them for everything by becoming turbo libs.