The date of her initiation into Freemasonry is uncertain, but the "Memoir of a Lady Freemason" indicates that it was between 1710–1712, before her marriage. In his paper in "Ars Quatuor Coronatorum" in 1895, Edward Conder states that it was sometime between 1710–1718. In a reply to the paper, Masonic scholar William James Hughan stated: "Until Bro. Conder’s investigations we had all assumed that the various reports respecting the initiation of the Hon. Elizabeth St. Leger, though not always in agreement, were correct as to the occurrence being of a later date than 1730." Hughan also found the facts related to contradict the statements made by an Aldworth descendant.