She crashed and burned spectacularly in 2020, not even making it to the Iowa caucuses. That was pre-Biden choosing her for VP.
I don't think people actually learning more about her while she served as VP, and in the 2024 presidential campaign exactly helped her electability.
If she's crazy enough to run again in 2028, I doubt she'd make it to whatever contest the Dems want to hold first.
IF she's crazy enough to ever run for POTUS again, she'd probably be smart to wait until 2032, since the sheeple have very short memories.