This is the core of her article from thepeerage. She bore no children. "Mary Bamfylde was the daughter of Sir Coplestone Warwick Bamfylde, 3rd Bt. and Gertrude Carew. She married, firstly, Sir Coventry Carew, 6th Bt., son of Sir William Carew, 5th Bt. and Lady Anne Coventry, on 1 July 1738 at St. George the Martyr, Queen Square, London, England. She married, secondly, Francis Buller, son of John Francis Buller and Rebecca Trelawny, before 1750. She died before December 1762.
From 1 July 1738, her married name became Carew. From before 1750, her married name became Buller.”
From artuk.org. Also posted to the Reign of Louis XV - 1715 to 1774 Album here.