Ethel A. O'Neil disappeared July 16, leaving behind her poodle Missy and her anxiety and depression medicine.
She had been planning to go shopping for makeup at the Everett Mall, just a three-mile drive from her home.
Her son, Pat O'Neil, says it's out of character for his mother to say she'll return and not, but adds she likely has early onsets of dementia. She has a cell phone, but relatives doubt it's on. She has credit cards, but there's no sign she's used them.
Her family believes O'Neil might have become lost. She was last seen in Marysville asking for a map and directions back to Everett.
The search for her has spanned from Glacier Peak Wilderness to forest roads between Granite Falls and Barlow Pass. Police have also looked for any sign of her in the county's densely populated west side and a State Patrol plane equipped with special cameras traced possible routes.
So far, there is no trace of her.
Her family hasn't given up hope. O'Neil is described as 5-foot-6 and about 120 pounds, with blue eyes and white hair. She was last driving a 1987 steel-blue Chevy Nova, Washington license plate ADP6803.