[1][2][3] In 1875, Cordery co-authored King and Commonwealth, a history of the great rebellion with her brother-in-law James Surtees Philpotts.
[2] On 15 July 1882 she married the historian Samuel Rawson Gardiner.
[1] As Bertha Gardiner, she wrote two books in the Epochs of English History series edited by Rev M Creighton: The Struggle Against Absolute Monarchy 1603-1688 (1877)[4] and The French Revolution, 1789-1795 (1883).
[5] Gardiner also edited a collection of documents from Thomas Tanner's manuscripts about Charles I's secret negotiations in 1643 and 1644.
[2] She died on 5 January 1925 at the Red House, River, Dover.