A young woman who works as a knife thrower and acrobat for a travelling circus. At the age of four, her family's wagon was caught in a crossfire, killing her parents and separating her from her two-year-old brother Triton. Cathy was adopted by the members of her parents' circus and grew up with them. When the Gundam pilot Trowa Barton asks to join, Cathy convinces the manager to let him. She soon adopts a big sister attitude with Trowa, even after learning that he is Heavyarms' pilot. She also helps take care of Trowa's friends, including feeding Wufei when he stays with the circus following the failed Treize assassination, and caring for Heero after his self-destruct. (Wikipedia)
In Frozen Teardrop
In MC0021, at the behest of Instructor W, Catherine takes under her wing a boy with no name who bears an uncanny resemblance to her brother Dokter T. She trains the boy to be a mobile suit pilot and to be able to withstand atmospheres unlike those on Mars that he is used to, as well as training him in circus skills such as knife throwing. Despite the years passed, Cathy is shown to still have a strong temper, punching the boy when they first meet for not saying hello when he arrived.