Green went on working at the PRO until shortly before she died, aged 77, at home in London on 1 November 1895, having passed her research on the Hanoverian queens to her friend A. W. Ward. Her work at the PRO was continued by the niece she had trained: Sophia Crawford Lomas. Both Ward and Lomas helped ensure that her "Elizabeth, Electress Palatine and Queen of Bohemia" (1909) appeared posthumously. She also intended to publish an edition of the letters of Elizabeth Stuart, Queen of Bohemia and collected over 400 transcripts. Other books of hers include "Diary of John Rous" (1856) and "Letters of Queen Henrietta Maria" (1857). She was also known for her philanthropy.