The young wildlife warrior was shocked to discover that the essay had been significantly edited by Clinton's staff.
Bindi is used to being the centre of attention, but today the focus was on her writing skills instead.
Her essay about saving the planet has pitted the teenager against one of the world's most powerful women - former First Lady and current US Secretary of State.More stories from Today Tonight
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"I think she is an incredible woman. She's a good advocator for women's rights," Bindi said.
However she went on to say that "I was really sad her organisation chose not to include my thoughts, my opinions on over human population."
Taking on Clinton doesn't seem to faze the fourteen-year-old who's been wrestling crocodiles since she could walk.
"It seems like the elephant in the room that everyone is ignoring, and an issue I want to be discussing," Bindi said of her essay.
At the centre of the controversy is freedom of speech, or the lack of it.
"The true test of freedom is speech is when someone says something that you don't like, and you are allowed to do that," she said.
Bindi was initially invited to write up to a thousand words on why she's chosen to embrace wildlife conservation.
"I believe that any problem facing our planet today to do with conservation steps from over human population," she said.
In her essay Bindi questioned how it's possible "that our fragile planet can sustain these masses of people."
Bindi says when "you look at how many people there are on the planet (and) I think about perhaps women (being) given a choice of family planning - helping make not so many children, making a difference."
She likened it to throwing a party and having too many guests - giving Clinton little reason to celebrate, as Bindi found out when she was sent back a cut-down version of her essay.
"Everything I had written about human over-population had been edited out," Bindi said.
"I was quite upset. I was a little bit angry because people don't want to talk about it. It's like a little bit devastating to find out that something (I'm) so enthusiastic about has got shot down."
The tough-talking teen wasn't given the opportunity to write a second piece.
"I did ask if I could have another go (but they) said I didn't have time, that I couldn't," she said.
"I believe as kids we're the next generation making a difference - the next voters, next decision makers. So as a child I want to stand up and make my voice heard."
Australian entrepreneur Dick Smith says Bindi's essay should be on the best seller list.
"We're part of the natural environment and we should live in balance, otherwise we will doom the human race - especially young people like Bindi," Smith said.
So impressed is Dick, he's nominated Bindi for his million dollar Wilberforce Award.
"It's for young people under 30 who become famous around the world for telling the story that you need, to have balance with perpetual growth," he said.