Sarah Punchard was born abt 1739 in Suffolk, England. 
Sarah died in 1819 aged ~80. She was buried at Hempton, Norfolk on 2 Apr 1819.
Sarah left a will  (An image can be viewed on ancestry)
death/burial indexed as Hempton, Suffolk but is in Norfolk; could refer to Ampton, Suffolk (near Bury St Edmunds); will records her as 'of Bury St Edmunds' but Fakenham is also mentioned - have used Bury St Edmunds until more certain.
Sarah was noted as a sister of "Mr C. Punchard, bookseller, Ipswich" in her 1819 obituary in Gentleman's magazine
Charles Punchard is mentioned as her (late) brother in her will and bequeathed £150 to "Sarah Bush the daughter of the late [Mr? ?] Bush who was brought up by my late brother Mr Charles Punchard" to be given when she turns 21 or gets married (also names 3 other sons of Bush - Charles, John and George)