Initially she is rather materialistic but less so after her marriage to Leandro and birth of her daughter Jacqueline. While living with Minerva she became more revolutionary. I think she evolves as a person through her sisters who are all political activists. By the end of the story Maria Teresa becomes an astute revolutionary,
"I see the picture of our president with eyes that follow me around the room, and I am thinking he is trying to catch me doing something wrong. Before, I always thought our president was like God, watching over everything I did."