Charlotte was a creation of Galah's TARDIS. She was based on Galah, which was why the Seventh Doctor felt he knew her when they first met. Like the other inhabitants Galah made, Charlotte could not permanently exist outside the Wychborn House pocket universe Galah had created. When that universe was going to cease to exist, the Doctor convinced Galah to use the remaining energy from her TARDIS to make Charlotte fully alive, then merge with her so they both could continue to live in some form. Charlotte married Richard Aickland after they returned to Earth. (PROSE: Strange England)
Richard and Charlotte were among the guests at Bernice Summerfield and Jason Kane's wedding in Cheldon Bonniface on 24 April 2010. (PROSE: Happy Endings)