Rose's ghost met the Pack in Curse Of Strahd, and invited them into the Durst Manor. In her room, she showed them how to enter the dungeons below using her dollhouse after they showed kindness to her. They escaped the Death House after killing Walter Durst; however, though she was destroyed in the resulting fire, the house's Curse remained.
The eldest child of Elizabeth and Gustav Durst, Rosavalda was a strongheaded and stubborn girl, intensely protective of her younger brother Thorn. She grew up fearing the "monsters" in the basement of the Death House, unaware of their true Durst legacy. She ultimately died of starvation, locked in her room along with her brother, but her Ghost stayed in the Village of Barovia.
The two of them haunted the area in front of the house requesting assistance to kill the monster, unknowingly guiding many adventurers to their deaths.