In UC 0136 she traveled to the Earth Sphere to warn government about her brothers' plan to attack the Earth from the Jupiter Sphere using a massive colony laser. When she reached the Earth Sphere her ship was attacked by Jupiter Empire military forces. The ship and its crew were lost but Europa escaped aboard a Diona. About to be captured she was saved by Tobia Arronax in the XM-X1 Crossbone Gundam X-1 Kai Kai "Skull Heart". She was brought aboard the Little Grey and upon learning that Tobia was with the Crossbone Vanguard tried to kill him in revenge under the belief that the Crossbone Vanguard killed Tetenith. Learning that Tetenith was still alive and living happily as one of the crew under the name Bernadette Briett, she lost her anger with the Crossbone Vanguard and sought their help in stopping her brothers' plans.
While Tobia was fighting Callisto's Shadow, she attempted to convince her brother to change his mind about his plans, to no avail. She then defended Tobia, to which he responded by suggesting she had developed romantic feelings for him, which she denied.
It is later revealed that both her brothers are able to read her thoughts through their psychic Newtype powers, ever since they were children. They used these powers to follow Europa, and by extension, the Crossbone Vanguard, whom they had set up Europa to encounter.
Europa had also lied, as she had developed feelings for Tobia, who reminded her of her deceased lover, Curtis, who had died in battle five years prior against space pirates.
Europa was killed during the final battle against her brothers, when she sacrificed herself by using her MS to propel Tobia away from the explosion of the colony laser.