 Later at Ken's birthday, Rinna engages in a conversation with Armstrong about Foster and the contradicting images on her Instagram and Armstrong reveals she thinks it's a misdiagnosis.During a visit to Vanderpump's house, Rinna reveals to Richards and Vanderpump that she believes Foster suffers from Munchausen syndrome, which leaves the other ladies confused and shocked.Shortly after the announcement, Davidson arrives and Rinna reveals she has partaken in a discussion about Foster's health and feels guilty.