(Portland, OR)  --  Police are searching for a missing developmentally delayed woman.  Police say 46-year-old Marvella Rauda-Nambo disappeared yesterday after being dropped off for an appointment near Southeast 100th Avenue and Division Street.  Authorities believe she may have gotten lost.  Police say she has an intellectual disability and functions at the level of an eight-year-old.  She's described as five feet tall and 130 pounds with dark brown hair.