Based on the Kwenn Space Station, Derrida was considered a sly, cunning adversary of Alliance operatives working there. Derrida earned a living by reporting Imperial authorities (such as Moff Alexander Julstan IV of Arkanis and other Imperial bureaucrats) about suspected Rebel activities. She has also worked as a spy for other people.
Derrida foiled five separate Alliance missions on the station and earned the personal enmity of Alliance operative Kassar Kosciusko. Among her work, Derrida framed Lieutenant Commander Zhir-Khan, falsifying records to implicate him in a betrayal of the Alliance, although her scheme eventually failed.
Rebel operative Lak Sivrak wrote a report about Derrida, with the contribution of Kosciusko. He decided that Derrida was a clear suspect on an attempt of the life of Rebel-aligned financier Director Meyser Kayson, and he was afraid of Kayson's Rebel links being discovered if Derrida was not dealt with.