In 2369, she joined the Cantabrian team upon Turner's request.
In that same year, when the Cantabrian and Wthaure battle cruiser engaged in a tense stand-off, Hernandez kept her cool. Her calming influence kept Turner calm and made sure the crew didn't over-react. Even after the subspace explosion damaged the ship, Hernandez responded "as any other officer would."
In 2372, Hernandez made her way to Starbase Expanse 4 in order to prepare the Cantabrian's new crew waiting there. While there, the Myhr'an attacked the starbase from orbit, killing her and nearly everyone else at SE4. (Star Trek: The Cantabrian Expeditions: "Catalyst, Part One")