Original: Quoted in Brandreth , pp. 105 -- 106 Heiress presumptive As a granddaughter of the monarch in the male line , Elizabeth held the title of a British princess , with the style Her Royal Highness , her full style being Her Royal Highness Princess Elizabeth of York .
Simplified: As a granddaughter of the British sovereign ( king ) , the princess was called '' Her Royal Highness Princess Elizabeth of York '' .