She helps her twin grandsons, Castor and Pollux, convince their father to take the family on a tour of the Solar System.
She convinces her son to extend the tour, and helps to pay for it by taking over his role as the author of the space opera serial The Scourge of the Spaceways, starring Captain John Sterling.
The character later appears in The Moon Is a Harsh Mistress (1966), which tells the story of the Lunar Revolution and bears out some of her claims.
She is recruited into the underground organization plotting to overthrow the government, and is placed in charge of the "Baker Street Irregulars", a group of small children used for observation and distribution of propaganda.
She is also one of the people who sign the Lunar Declaration of Independence, and is adopted by the narrator and his family (he is part of a group marriage).