This is likely to be explored in season three of the series, which will see new actors take on the roles of the monarchy, it will be set in later years.
In the period drama's second season, the story will move onto the second half of the 1950s, covering everything from the Suez Crisis in 1956 to the retirement of Harold Macmillan in 1963.
Aside from dealing with her wild child sister, the trailer for the second season promises a struggle for Elizabeth with a monarchy in crisis.
He was 17 years younger than her.
He was 17 years younger than her By 1976, Margaret's marriage had broken down, in part thanks to another scandal involving Roddy Llewellyn, who hit the front pages whilst on Mustique with the Princess looking very close.
This was always denied by Margaret, who insisted they were just friends; but the plot thickened when he committed suicide, 18 months later, suffering from depression.
It's still not known who will take on the role of the middle-aged Margaret - only Elizabeth has been re-cast, with Olivia Colman in the role.