Najla Ayoubi, who lives in the US after "fleeing for her life" from the Taliban, said she has heard horrific examples of violence against women since the militants took control on August 15.
Followers signed up for $5,000, five-day self-help courses, but some were then financially and sexually exploited.
The 40-year-old philanthropist and former equestrian showjumper is the daughter of Edgar Bronfman, the late Canadian chairman of liquor giant Seagram.
