Death date of British Countess (July 9, year unknown) of The Countess of Shaftesburg, 81 yrs. at death.?

Answer 1

Lady Constance Sibell Grosvenor (Countess of Shaftesbury) was born on 22 August 1875. She was the daughter of Victor Alexander Grosvenor, Earl Grosvenor and Lady Sibell Mary Lumley. She married Anthony Ashley-Cooper, 9th Earl of Shaftesbury, son of Anthony Ashley-Cooper, 8th Earl of Shaftesbury and Lady Harriet Augusta Anna Seymourina Chichester, on 15 July 1899. She died on 8 July 1957 at age 81.

Answer 2

Could be your looking for The Countess of Shaftesbury.
If so there was one who lived to that age-Constance Sibell (nee Granville) and she died in 1957.
I don't know if that was July 9th.but maybe this will help you to go further.
Good Luck