Zezanne was Miranda Dawkins' daughter.
After escaping the destruction of the Council of Eight's Time Station in the Jonah, Zezanne and Soul suffered complete amnesia. They landed in a London junkyard in 1963, and the Jonah changed appearance to that of a Metropolitan police box. Soul took the form of an old man and believed he was called the Doctor, and Zezanne decided she was his granddaughter. They began to travel together in that universe, one of many alternatives now free and wild in the Post-War universe. (PROSE: Sometime Never...)
Behind the scenes
Zezanne is based on early descriptions of Susan Foreman in the Dr. Who memo: her name sounds like "Suzanne"; as daughter of the Empress of the Universe, she is a princess; and she is the Doctor's granddaughter.