Changing fortunes: since she was helped to return to school, Penelope Machipi has gone on to pursue film-making

Among the crowd at Fortune magazine’s “Most Powerful Women” summit in San Diego on Monday night – which included Condoleezza Rice. the former US secretary of state, and Carol Bartz, the chief executive of Yahoo – was Penelope Machipi, a 22-year-old from rural Zambia.