Lianjie Guo, 47, and her husband came to Canada to visit their son but she hasn't been seen since June 7, the day she was scheduled to fly back to China, said RCMP Cpl. Sherrdean Turley.
Turley said the disappearance is considered suspicious and foul play has not been ruled out.
"All of her personal belongings have been left behind, including her identification, which includes her passport," Turley said.
But Turley added that one thing that is missing is an umbrella. It was raining the night Guo went missing and police believe she might have taken it with her when she went for a walk.
Guo had almost no knowledge of the Lower Mainland and couldn't speak English.
Her son said it makes no sense for her to just vanish this way.
“I have no idea what happened with my mom. The one thing is, we are still waiting, waiting for my mom."
Police have been conducting a grid search in the grassy areas of some Richmond trails and plan to expand the search if no trace is found.
Turley said police dogs have also been brought in to help.