Her speeches cover subjects ranging from co-parenting to being a successful businesswoman. And in them, a pal tells the Daily Mail, Sarah - who at one point owed almost £5 million to the Queen's bankers Coutts - talks about how she changed her life, a reference to the success she's had in turning around her finances.
Contributing to her new financial wellbeing in addition to public speaking commissions is her ten-year role as the face of international healthy eating organisation WeightWatchers, and a signature jewellery line.
For all her business success, the Duchess - who spent the weekend in Spain watching the final of the Gold Cup Polo with Princess Beatrice and Princess Eugenie - has always put her role as a mother first.
"For ten years she commuted to America, always making sure she was back at weekends and holidays for her daughters," adds the friend.