She isn’t “going through the card” after all
As you probably know, the list of women who have been beheaded in England is very short. Helena Bonham Carter has played two of them so far – Lady Jane (1554) in 1986 and Anne Boleyn (1536) (opposite Ray Winstone’s Henry VIII on ITV) in 2003 and I heard that she was about to play a royal character named Margaret.
Further reading informs me that this is to be Princess Margaret, late sister of Her Majesty and Countess of Snowdon, NOT of Salisbury (1541). The other beheaded women in England were Katherine Howard and Jane, Viscountess Rochford (both 1542), Mary of Scotland (1587) and Alice, Baroness Lisle (1685).