Madonna is renowned for being strong minded, not weak. And she's the most valuable conquest Kabbalah Centre has made.
KC has acquired its subjects because of its many years experience in grooming and recruiting -- and by NOT telling people full information about what will be done to them after they get emotionally involved.
Best move you can make is education.
The most complete up to date information on how to understand and respond to a cult situation is to get and read Cults Inside Out: How People Get in and Can Get Out
by Rick Ross. Detailed descriptions on how you can cope, and how to research the situation.
Lots of information about Kabbalah Centre in the CEI archives
Lots of earlier CEI discussions of Kabbalah Centre