Being Portuguese myself, I remember quite well this lady and her arrest.
Totally unfair if you ask me... She was set-up by something much bigger than herself.

You can't run a scam for 14 years, even in Portugal with the Salazar regime still on, and even after the 1974 revolution and stay in business for long.
She probably was the front for some money laundering operation. Not that she was a commodoties trader or investment banker, simply paid good returns on the investment. Where those returns were coming from... that's another question.

Anyway RIP D. Branca.