Link without paywall https://www.yahoo.com/news/videos/senator-says-secret-briefing-iran-104446637.html
Elizabeth Warren said a classified briefing about Donald Trump’s war on Iran has confirmed the situation surrounding the controversial conflict is even more dire than expected. The Massachusetts senator was among a number of Democrats who attended a closed-door meeting Tuesday about the president’s war in the Middle East, and warned that the administration has no clear plan to end the conflict, or any real justification for starting it. “Here’s what I can say: It is so much worse than you thought. You are right to be worried,” Warren, 76, said in a video posted online.



She’s been very consistently and vocally opposed to war in Iran. https://www.warren.senate.gov/newsroom/press-releases/icymi-in-floor-speech-warren-slams-trumps-war-in-iran-exposes-10-ways-big-beautiful-bill-increases-costs
Trump didn’t say shit about going to war with Iran before doing it. It’s probably the most impulsive thing he’s done as president, (so far), which is why we’ve heard several excuses for why he did it and why these excuses he gives seem to contradict each other.
It was definitely naive and unnecessary for her to stand and applaud in hindsight, but keep in mind Trump had been in the middle of negotiating peace talks. Warren (and literally everyone else) did not know that he was going to just suddenly pivot away from the ongoing peace talks and try to kick off armageddon to avoid facing accountability.
She, like most Democrats, are vocal about lots of things, then their actions tell a different story.