A Southern California mother has been missing for two weeks after what was supposed to be a quick trip across the border to Mexico.

Police in Santa Ana are looking for 21-year-old Yasmin Gonzalez Benitez, who has been missing since March 15 after telling her roommate she was heading to Tijuana to visit family.

She was last seen at her home on the 900 block of Pine Street in Santa Ana before getting into a car with relatives and heading across the border, police said.

The young mother was only supposed to be gone a day, but no one has seen or heard from her in two weeks. She left her four-year-old daughter in the care of her roommate and never came back. The child has since been placed with Child Protective Services.

“So, unfortunately our detectives made numerous attempts to contact Yasmin’s brother and mother and they’re being very uncooperative,” Natalie Garcia with the Santa Ana Police Department said.

A roommate told police that her mother and brother may have taken her to a facility in Mexico, a claim police are working to verify. There was also a claim that Gonzalez Benitez was going to visit her brother.

Investigators have not been able to confirm whether Gonzalez Benitez, who was born in the United States, has a brother in Tijuana.

Garcia said the circumstances surrounding her disappearance are concerning, adding that it would be out of character for Gonzalez Benitez to leave her daughter behind for so long without any explanation.

“She would take her to preschool,” Garcia said. “She would come home. She would work, but she always had someone in the care of her daughter. She never left for more than a couple of days with the daughter, so this is very suspicious to us.”

Police are asking anyone with information about Gonzalez Benitez’s whereabouts to come forward.