During the war between the Republic and the Sith Empire, Sophia became a noble friend to Gaden-Ko, a Mystic in training. She eventually helped the Barsen'thor when the young Jedi Consular arrived on Voss in search of an alliance against the Empire, suggesting that the Barsen'thor help her friend Gaden-Ko in his training to gain the trust of the Voss. However, when Gaden-Ko came back with the Barsen'thor to ally with the Republic, Sophia revealed herself to be a child of the Sith Emperor.
With two Sith acolytes by her side, Gaden-Ko was clueless as to why she betrayed him and the Jedi, but she told him not to worry, and that his true destiny was just the beginning. She and the acolytes engaged the Barsen'thor, but the Jedi took the upper hand and defeated them in combat. Sophia was wounded and was surprised how the strong the Jedi was in the light side. As a child, she believed that the dark side was the true power. She revealed to Barsen'thor that she was hoping the pilgrimage would test Gaden-Ko's power, and hopefully result in the Barsen'thor's death. She feared that the First Son would kill her for her failure, but the Barsen'thor believed that they could save her from the First Son's wrath and tried to convince her to let go of the dark side.
Sophia explained to the Jedi about how the First Son served the Emperor. At this moment, Gaden-Ko said that he was upset that his own friend betrayed him. Sophia apologized for her actions, saying she wanted to save him and allow the people of Voss to serve the Emperor and Sith Empire. She was taken into custody by the Voss officers, who said she would be forced to take the 'step of harmony,' a Voss sentence where a criminal would fall off the mountain of Voss-Ka. Despite the Barsen'thor's argument that the sentence was barbaric, Sophia was taken away.
- Star Wars: The Old Republic (First appearance)