Elle est mariée avec Robert Stewart Markgraaf van Londonderry.
Ils se sont mariés le 7 juin 1775, elle avait 24 ans.
Enfant(s):
Lady Frances Pratt was the daughter of Sir Charles Pratt, 1st Earl Camden and Elizabeth Jeffreys.
She married Sir Robert Stewart, 1st Marquess of Londonderry, son of Alexander Stewart and Mary Cowan, on 7 June 1775. She died on 18 January 1833.
Her married name became Stewart.
http://thepeerage.com/p1161.htm#i11602
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