Princess Margaret is still pretty spirited at least according to Helena Bonham Carter .

The actor, who plays the royal who died in 2002 in Season 3 of Netflix s The Crown , told the audience at the Cheltenham Literary Festival that she did some pretty thorough research into the life of Queen Elizabeth II s younger sister. This included talking to friends, ladies-in-waiting and relatives. But, according to The Guardian , she didnt stop there.