Nothing is known about Sofia before the apocalypse, except that she worked at the Abigail Family Vineyard.
She is later seen among the group of people gathered around after Strand shot Thomas Abigail, in order to stop him reanimating.
After Daniel Salazar burns down the vineyard, she makes and escape with Juan. She is later seen in the episode Grotesque, talking to Nicholas Clark, giving him supplies and directions to Tijuana. She then drives away with Juan, in order to take him to his father in the city of La Paz.