When Suzanne, her daughter, and her husband are seated at the table for dinner, there are four places set, and the fourth plate is even full of food. But there's no mention of a fourth person coming to dinner, as Cassie declines the invitation, and the housekeeper has her own family dinner to go to.
Suzanne calls Cassie to help cater a party, but at no point does Cassie ever give Suzanne her phone number.