 She married her cousin, George Waldegrave, 4th Earl Waldegrave, in 1782.Lady Elizabeth Laura was born on 25 March 1760, the eldest daughter of statesman James Waldegrave, 2nd Earl Waldegrave, and Maria Walpole, the illegitimate child of Sir Edward Walpole by his mistress, Dorothy Clement.She had two younger sisters, Lady Charlotte Maria, later wife of the 4th Duke of Grafton, and Lady Anna Horatia, who would marry Lord Hugh Seymour.