(Aloha, OR)  --  Police are searching for a missing Aloha woman who suffers from memory problems.  The Washington County Sheriff's office says 69-year-old Isabel Espinoza was last seen around 2 p.m. yesterday near Southwest 198th Avenue and Alexander Street.  Police say she may be having trouble finding her way back home.  She was last seen wearing a black shirt with blue jeans, a black scarf and a black hat.