She was the wife of Thomas Pakenham, 1st Baron Longford, the mother of Edward Michael Pakenham, 2nd Baron Longford, and the grandmother of Thomas Pakenham, 2nd Earl of Longford.
Elizabeth was the only child and heiress[2] of Michael Cuffe, MP, and his wife, the former Frances Sandford, a descendant of George FitzGerald, 16th Earl of Kildare.
[4] The family seats were Pakenham Hall in County Westmeath[7] and Longford Castle in County Longford (demolished in 1972).
[8] The Countess of Longford survived her husband, who died in April 1766, aged 52; his title was inherited by their eldest son, Edward.
When the countess died in January 1794, aged 74, she was succeeded in the earldom by her grandson, Thomas, her eldest son Edward having predeceased her.