Hillary is furious — and while Clinton advisers think that may save her, it’s making the lives of those who work for her hell.

“Hillary’s been having screaming, child-like tantrums that have left staff members in tears and unable to work,” says a campaign aide. “She thought the nomination was hers for the asking, but her mounting problems have been getting to her and she’s become shrill and, at times, even violent.”

In one incident, Hillary berated a low-level campaign worker for making a scheduling mistake. When the girl had the nerve to turn her back on Hillary and walk away, Hillary grabbed her arm.

Hillary’s anger may be stoked by fear: Her poll numbers have slipped by 10 points in one week on the eve of the Democratic debate.

Bill Clinton and Hillary’s campaign team are concerned that her anger may surface at the wrong time. They are concerned that she could have a serious meltdown in front of TV cameras, which would make her look so out of control that voters would decide she doesn’t have the temperament to be commander in chief.

“We’re having some success in giving her some chill pills,” said a campaign adviser.

The goal is to channel her anger and make her focus on Republicans, not on her campaign aides and fellow Democrats.

“Hillary’s always at her most effective when her back is to the wall,” says one of her longtime political advisers. “After weeks of pounding and pummeling by the press, she’s mad as hell and isn’t going to take it anymore.”

The plan is already in play. Over the past two weeks, she has slammed the Benghazi hearings as nothing more than a Republican-instigated political witch hunt aimed at suppressing her poll numbers.

She’s bashed the Supreme Court and the National Rifle Association over the Second Amendment.

She’s thumbed her nose at President Obama by coming out against one of his major foreign-policy goals — the Trans-Pacific Partnership.

And with her approval, her opposition research team has been collecting dirt on Vice President Joe Biden, which Hillary’s camp is prepared to release to the media if Biden enters the nominating race following his family summit this weekend.

“She’s beginning to understand that she can use her righteous anger and indignation to good effect,” said the adviser. “After all, her anger is in keeping with the mood of the American electorate.”

Edward Klein’s latest book is “Unlikeable: The Problem with Hillary” (Regnery Publishing). Visit edwardklein.com.