Acting Sgt. Jeff Scott says an Amber Alert has been issued in Washington state and authorities on both sides of the border are working together to find the mother and daughter.
They were traveling in a grey 2003 Toyota Corolla, with British Columbia license plate 228MJT.
"Makayla is 4'5" tall, and about 60 pounds.
An amber alert has been issued in Washington State for a nine-year-old B.C. girl who police believe has been taken by her mother into the United States.
The girl is Filipina, with dark brown eyes and hair. She was last seen wearing a black jacket and dark trousers.
They say Estrada violated a court order and took Makayla during a custody visit last night. She was last seen wearing a white jacket, blue jeans and black rain boots, carrying a purse.
Officials said Estrada's intentions with the child are unknown, and police fear for her safety.
The New Westminster Police Department was alerted of the alleged child abduction Sunday, Jan. 22 after it was reported that Makayla Estrada-Weber was missing.
"Anyone who has information about their whereabouts is asked to call us immediately".
If you see her or the suspect's vehicle, please call police.