The royal admits that despite "Fergie-baiting selling a lot of papers in Britain", Finding Sarah, to be aired on the Oprah Winfrey Network in the United States, may not go down well with a British audience.
"Could it air in Britain? Probably not without dramatic ramifications and negativity - because I think that it's difficult," she said.
The show, touches on subjects including the Duchess's exclusion from the royal wedding and her role in a scandal in which she admitted trying to sell access to her ex-husband to an undercover News of the World reporter.
"I knew this guy was wrong. I knew that he was a journalist," she said of the newspaper sting.
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"I had an instinct as it was - and yet my people-pleasing addiction kept me going, if he could help me and if he could invest in my business - and he also promised to build schools in Afghanistan - maybe then everyone would love me more or maybe then all my staff would be paid. And you know what? It wasn't real. Why didn't I just listen?"
"You live with regret ... that's the most difficult thing I've had to learn."
