Maria Allman

Commander Maria Allman is a Starfleet officer who is serving as the chief medical officer aboard the USS Valentine, replacing Amy Green. (Star Trek: The New Adventures)

Allman saw an opportunity to have a position aboard the Valentine when the Chief medical officer spot was open. (TNA: "The Unexpected Child")

Background information
Doctor Allman was played by Alexa Mulhall.

Director Thomas G. Guttfield decided to fire actress Louisa Baxter after claims she committed a murder, she is still trying to fight this battle in court, as a result they had to hire Mulhall as her replacement.

Originally Allman was an Indian doctor, however the idea was scrapped due to unknown reasons so they changed the descent to Italian, despite the fact that Mulhall was British.