[ She could mention how it's hard to do regular incantation-based exorcizing when she's a rock star, but... she'll save that for later. ]

Good spirits are not enough! This sort of evil always prevails... but if you must, you should pass on the message that if the other members of this household wants to stay safe, they should wear garlic around their necks and keep salt in their pockets at all times. Otherwise, they'll be prone to possession and when the spirit finally has a host...