Sarah Osborne

http://thepeerage.com/p54711.htm#i547107

Hon. Sarah Byng was born on 2 October 1695.2 She was the daughter of Admiral George Byng, 1st Viscount Torrington and Margaret Master.2 She married John Osborn, son of Sir John Osborne, 2nd Bt. and Elizabeth Strode, on 8 August 1710.1 She died in November 1775 at age 80.

https://www.chicksandspriory.co.uk/the-osborn-family

Sir John Osborne, 2nd Baronet (1650-1720) ​
Sir John outlived his son John by two years, leaving his son's widow Sarah Osborn (nee Byng) to manage the estate during Danvers' minority.

Sarah died in November 1775 and was buried at Campton in Bedfodshire on the 22nd. She is remembered because of her letters which were published in 1890.

References

• Political and social letters of a lady of the eighteenth century, 1721-1771; by Osborn, Sarah Byng, 1693-1775, Emily Osborn ed., 1891 Publisher New York, Dodd, Mead & Company, Archive.Org