Messages from Gallifrey
Granddaughter of the Doctor
Susan was dropped off on Earth by the (First) Doctor in 2164, at the end of The Dalek Invasion of Earth. Her husband, a former resistance fighter, died in 2210. After that, she moved to a small cottage in Chesham while she finished growing her own TARDIS. She grew tired of waiting for her grandfather to return to her, so she left her home in 2250 to explore in a “brand-new” Type-40 TARDIS.
She returned with her friends to the cottage, albeit ten years later. That’s when a Dalek colony began to awaken, and that’s when another TARDIS got involved. So she left her newfound friends with a TARDIS in Siege Mode, a cryptic set of messages, and a Dalek problem.