Because she married a commoner!
The question of Patricia's marriage was the subject of much speculation in the
Edwardian era, as she was considered one of the most beautiful and eligible royal princesses of her generation. She was matched with various foreign royalties, including the
King of Spain, the
Prince Royal of Portugal, the future
Grand Duke of Mecklenburg-Strelitz[10] and
Grand Duke Michael of Russia, younger brother of
Tsar Nicholas II.
[4]
In the end, however, Patricia chose a commoner rather than a husband of royal blood. She married naval Commander (later Admiral)
Alexander Ramsay (29 May 1881 – 8 October 1972), one of her father's aides-de-camp and third son of the
13th Earl of Dalhousie, at
Westminster Abbey on 27 February 1919.
On the occasion of her marriage, Princess Patricia of Connaught was permitted by Royal Warrant to relinquish the style of Royal Highness and the title of Princess of Great Britain and Ireland.
[1] She was granted by Royal Warrant of 25 February 1919 the style of Lady Victoria Patricia Helena Elizabeth Ramsay, with special precedence immediately before the Marchionesses of England.
[1] Since the Royal Warrant stated that her change in style took effect only upon the solemnization of her marriage, she entered the church as a Princess and Royal Highness and left as a Lady, a daughter of a royal duke.