Christa Mazza is one of the pre-made downtownies in The Sims 2: Nightlife. She can be made playable by befriending and asking her to move in, or by marrying her. Christa's career is randomized at the start of the game and she is mainly interested in food, weather, fashion, travel, crime, and work.
Her name is randomized when Downtown is generated. The name "Christa Mazza" is only referenced in the game files. According to her SimDNA in SimPE, Christa's hair was black before it turned grey. Ironically despite her Aspiration, she has no interest in money.
Despite being a Fortune Sim, Christa has the lifetime want to reach the top of the Culinary career. This want makes her compatible, at least in theory, with a Popularity, Romance or Pleasure Sim, though she would have better chemistry with another Fortune Sim.