(Covers information from Anderson's universe)
"Daughter" was a citizen of Raccoon City and the daughter of "Zombie Dad". During the 2002 Raccoon City incident, she and her father were among the civilians trying to escape through Raven's Gate Bridge. When her father transformed into a zombie, the bridge exit was shut down and she was left behind.
No actual name was provided for "Daughter" and "Zombie Dad" outside of the names given in the film's credits.