 They subsequently called an ambulance and Rosemary went to hospital, where she told Grayson what had happened and vowed revenge.Rosemary was determined to get her revenge on the Kings, specifically Matthew, and see Grayson married to a woman who was not "a danger to the family name".Trying to get Perdita out of the way, she meddled with Perdita's pills so Perdita thought she was going mad.