On 19 March 1719 she was further created Duchess of Kendal, Countess of Feversham and Baroness Glastonbury, in the Peerage of Great Britain.

The Duchess of Kendal was a very thin woman, being known in Germany as "the Scarecrow" (German: Die Vogelscheuche) and in England as "the Maypole".

The Jacobites called her "the Goose", most famously in the taunting Scots ballad Cam Ye O'er Frae France.

[5] She obtained large sums of money by selling public offices and titles; she also sold patent rights, including the privilege of supplying Ireland with a new copper coinage.

This she sold to William Wood, a Wolverhampton merchant, who flooded the country with inferior coins, leading Jonathan Swift to write his Drapier's Letters.