When Rose Weasley faked being sick so she didn't have to go to The Burrow; she didn't having betraying her cousin in mind. Rose/Teddy

Rosabel Giordano was just another victim caused by the hands of Lord Voldemort, her father. She gets her chance to revenge him when Dumbledore asks her to help Harry bring down Voldemort. However, Rose had no idea what she was getting herself into.