In the Senate, HRC tried to have Iran's National Guard declared a "terrorist group," placing the country within the scope of the "Global War on Terror." It's really not that inconceivable that she'd work with the GOP to start the conflict with Iran that they and Netanyahu are dreaming about.
She also supports (and sent Jake Sullivan to lay the groundwork for in 2012) the nuclear deal signed with Iran. Even many of those opposed to the deal wouldn't start a war with Iran. So it's even more absurd to think that someone who supports it would.
I mean, even the Bush administration, certainly no nest of doves, held back on attacking Iran in 2006-2008.
Hillary gave the Bush administration the green light to attack with her vote for Kyl-Lieberman. The fact that the Bush administration didn't do all the warmongering that Hillary allowed them to do does not reflect well on Hillary.