Maria is described as having dark, reddish-brown hair & hazel-brown eyes.
She originally was more of a bookworm, but later became more outgoing and athletic. She is a member of the Stoneybrook Day School swim team, where she won trophies for swimming butterfly stroke and holds the school record for breaststroke.
In Kristy and the Sister War she and Tiffany start to feel left out and hurt when her parents and Shannon were too busy for them. After failing to help Shannon as best as they could, they started a prank war against her. They also plan the all kids dance for the community. She and Tiffany fight over Jordan Pike before dancing with Adam at the dance. Shannon, Tiffany, and Maria all get make up at the dance.
In Karen's Secret Valentine, she and her friends put on an ice show for the neighborhood.
- Astrid, a Bernese Mountain Dog is the family pet.
- Tap dancing
- Word searches
- Maria's bedroom is described as having pink wallpaper with a heart pattern, stuffed animals propped up all over, and framed swim team photos over her desk.