Sierra had the role the 'Heiress'. She unfortunately died to demonic possession after Matt read the instructions incorrectly. He either had the option of killing Sierra or himself, but he killed Sierra without knowing of the other option.
An Invitation (Episode 1)
Sierra had no actual lines beside laughter up until the dining scene. Joey asked Sierra what she thought of his new estate. Being the Heiress, Sierra replied saying it was cute. She confessed; 'I just come from a really rich family, don't really work, I was handed a lot of things in my life.'