Whisper Owen, 36, and her infant daughter, Sandra McCarty, were last seen on July 15, according to the Fresno County Sheriff’s Office.

“I’m desperate to find my daughter and her baby,” Owen’s mother, Vickie Torres, tearfully told CNN. “It’s like she vanished into thin air.”

She added she was frustrated with the limited law enforcement effort to locate the two.

“We need this to go further. We need more help,” she said.

“We are doing everything possible to collaborate with law enforcement agencies north of our jurisdiction to inspect areas where Whisper Owen is commonly known to visit,” stated the Fresno Police Department in an email to CNN.

They have also shared photos of Owen and McCarty with law enforcement agencies across the state.

Richard Owen shared with CNN that he has spent recent nights sleeping in his car as he, along with his wife, scours highways and back roads near the location where his sister disappeared.

He described his sister as a loving, trusting person who would “roll her window down for a stranger, whether it’s 2pm in the afternoon or 2am in the morning.”

CNN has reached out to the Fresno County Sheriff’s Office, the Fresno Police Department, and the Sacramento Police Department for more information.

“At this point, I’m not ruling out anything,” Richard Owen said. “I’m trying to find her in any way possible.”