She became Lady of the Bedchamber for Princess Caroline of the Royal House of Hohenzollern.

The daughter of Sir Thomas Slingsby, 2nd Baronet, and his wife, Dorothy Cradock.

Richard Arundell (1698-1759), who became MP for Knaresborough, Clerk of the Pipe, Surveyor of the Works and Master of the Mint.

The earl and countess had one daughter, Lady Barbara Herbert (died 27 December 1752), who on 3 October 1730 married William Dudley North.

In 1718, the countess became a Lady of the Bedchamber to the Princess of Wales, Caroline of Ansbach, retaining the position until her own death three years later.