Not much is known about Hilde. She first had contact with Duo Maxwell, pilot of the Deathscythe and Deathscythe Hell gundams. Duo had been attempting to infiltrate OZ's ranks, but his attempt failed. He stole a Leo and headed for the moon; Hilde followed him, and Duo was captured.
Later when she was interrogating him, Hilde realized that OZ did not have the colonies' best interests at heart, as she had been led to believe. Duo escaped and headed for the moon again. Hilde followed him once more, but this time she was assisting him by fending off the Taurus mobile dolls allowing Duo enough time to break into the moon base.
A few weeks later, Hilde disobeyed Duo's order to stay away from the fighting and stole information from the space ship, Libra. On her way off the ship, mobile dolls attacked her. She fought them off, until Duo, in the Deathscythe Hell, arrived and destroyed them.
Hilde is a strong woman, because of her courage in facing opponents stronger than herself and for her dedication to the colonies. She risked losing everything to aid the few people who could bring about the downfall of OZ and the Romefeller Foundation.