Sure. Though we can’t quite know if even that’s true as she did not become president.

I'm not sure what you're referring to. We cannot look into an alternate timeline.

Former presidents do not have power over current presidents.

We can look at her public statements. And those compared to this make it clear Biden was definitely worse

https://jewishcurrents.org/joe-bidens-alarming-record-on-israel

At this crucial juncture, Biden undercut Obama again. After Clinton’s ultimatum, the vice president—who was still traveling in the Middle East—contacted Netanyahu himself. In their book Our Separate Ways: The Struggle for the Future of the U.S.-Israel Alliance, Dana Allin and Steve Simon describe Biden’s discussion with the Israeli prime minister as “a conciliatory call” that had the effect of “undercutting Clinton and reinforcing Israel’s generally dismissive approach to the administration’s periodically tough messaging.” An administration official remembers being “astonished” upon seeing the transcript of the conversation: “Biden completely undercut the secretary of state and gave Bibi a strong indication that whatever was being planned in Washington was hotheadedness and he could defuse it when he got back.” When Clinton saw the transcript, the official recalls, she “realized she’d been thrown under the bus.”

Biden's been derailing US foreign policy on the Israel since he was vp.

Was still pretty much the biggest self-sabotaging way of communicating that sentiment in the campaign.

Yes.