Unlike the full-time employees doing similar work, such as Sir Thomas Duffus Hardy, and the three male free-lancers working on the calendars, who all had paid assistance, Green's only helper was her sister Esther, but she became the "most highly respected" and "most efficient compiler of calendars". She sometimes complained about being paid less than the men, and also disputed editorial questions with her superiors. Romilly did eventually agree to her suggestion of historical prefaces written by herself and the other editors, and these came to be seen as an essential part of the calendars. Green herself wrote 700 pages of prefaces which amount to a history of seventeenth-century England.