As a young girl, she met Camio and learned of his demon heritage. Despite this, Maria fell in love with him,and vice versa. The promised to leave together, but Camio did not keep it (and Maria knew he wouldn't), leaving her to wait on a train station.
Sometime after that, Maria was diagnosed with a lung disease and told she only had a certain amount of time to live. Later, Maria became the Dorm Mother for the Johannes Dormitory at William Twining's school, Stratford, where her love was, under the guise of Nathan Caxton.