Margaret Webster was an Earth human. In 2011, she was in the Hawkshaw Manor Nursing Home. When she died that year, her mind was transferred into a younger cloned body by a Vorlax Regeneration Drone hiding in the nursing home. Margaret was then absorbed by the TARDIS when she touched it. (COMIC: Do Not Go Gentle Into That Good Night)

Later, the TARDIS absorbed several other beings, which merged to form Chiyoko. Amy recognised Margaret's face on the side of the TARDIS. (COMIC: Apotheosis) The Eleventh Doctor was then brought to the Museum of Lost Opportunities, where he used its Time Scoop to gather Chiyoko's components, including Margaret, from before they were absorbed by the TARDIS. The Doctor convinced Chiyoko to unmake itself, thus permanently freeing Margaret and the others. (COMIC: The Child of Time)