Perhaps this should be moved to "Eliza" so that Christine Summerfield ("real" universe) doesn't need an awkward disambiguation.
Talk about it here.
Cousin Eliza, originally named Christine Summerfield and later called Horus, was a clone who became a member of Faction Paradox and aided Justine McManus in her quest to save the universe from Lolita.
Eliza was created in a bottle universe and named "Christine Summerfield" after Bernice Summerfield and her creator Chris Cwej. Her memories were taken from a "blonde girl" from the 1970s, who lost her virginity at the age of 15 and had an interest in serial killers like Jack the Ripper and Charles Manson. She was also fascinated with the supernatural, often visiting the seer Lady Diamond.
Following the invasion of the bottle universe's Earth by Cwej's employers, the Great Houses of the Time Lords, Christine left the bottle universe and entered the main universe. After being dropped off on Ordifica, she visited a number of colony worlds including Shristostophon, Gardener's World, Hai Dow Seven, Lubellin, Shatner's Climax and Ultra Caprisis. Christine eventually visited the ruins of Gallifrey, where she wrote most of her journal before heading towards Dellah. (PROSE: Dead Romance) Christine later sent a letter to Bernice, where she said that she took a post at a university on the planet Vremnya. (PROSE: Twilight of the Gods)
She later took on the name Eliza, intentionally referencing both the main character of My Fair Lady and one of Jack the Ripper's victims, and became a Cousin of Faction Paradox. She survived the destruction of the Eleven-Day Empire with Cousin Justine and planned to save the surviving members of the Faction from Lolita. (AUDIO: The Eleven Day Empire, The Shadow Play) Eliza broke Justine out of the Great Houses' prison planet with the help of criminals and newly freed members of Faction Paradox. (AUDIO: Movers, AUDIO: A Labyrinth of Histories)
To prevent Sutekh from gaining control of the Osirian Court, Anubis merged Eliza's biodata with Osiris's to turn her into Horus. Lolita added a drop of her own biodata to the mixture. (AUDIO: Ozymandias) Sutekh proposed a fight to the death with Horus to settle the claim. Sutekh won the battle and Eliza died in the fight. (AUDIO: The Judgment of Sutekh)