She's really not doing that well. She just came out of her convention and had the media giving her Pravda-level support and bias. Despite that, no serious polling shows her with a comfortable lead even in the national polling. If she didn't have ridiculous levels of media support and bias, she'd struggle to get 150 electoral votes.
But things are only going to get tougher. RFK is out of the race and backing Trump. From this point, she's going to face real questions. She will have to debate Trump. So long as he doesn't act like a total jerk-off or otherwise trip over his own junk (a very big if), it's only going to go downhill from here.
At the end of the day, she's a crappy candidate, and that didn't change just because Nancy Pelosi and Chuck Schumer Pete Rose'd Joe Biden.