Expressing the vague potential to confront a far-right Israeli government isn't going to lose her any Democratic votes
No, but it would cost her millions in donations and support from Zionist lobbies. It would also push those same lobbies to more heavily donate and support the GOP. Not to mention the millions that would be at stake from weapons manufacturing lobbies who would see any wavering on Israel support as potential to lose one of their biggest buyer. All that lost money would lead to a loss in votes.
The world is complicated and a tangled mess.
Doesn't matter, go fucking vote. Vote like your life depends on it; depending on your demographic that could very well not be hyperbole. Vote like it's a terrifyingly close election, because despite all the polls and the analysts, this election is still going to come down to razor thin margins. It is VERY hard to compete with the sheer fanaticism of Trump's base; a large number of them literally think he's the Messiah or that Harris is the antichrist so they feel justified in all sorts of batshit actions.