A missing Texas teenager told her best friend 'I love you' the day before she mysteriously vanished on Christmas Eve. 

Camila Mendoza Olmos, 19, was last seen on a neighbor's surveillance camera leaving her home in a San Antonio suburb at 6:58am Wednesday, and her disappearance has sparked a huge ongoing search. 

Her childhood best friend Camila Estrella said they last spoke the day before Olmos's disappearance over the phone, and made plans to go dress shopping for her boyfriend's family event. 

Recalling Olmos's parting words to her as they hung up, Estrella told the New York Post: 'She said, 'Bye Cami, I love you.'' 

Estrella said they spoke almost every day, and described the 19-year-old as 'someone that was just full of love.' 

'This is so random, we never expected this,' she said of Olmos's disappearance. 

Olmos's loved ones have issued urgent pleas for her to be found safe, with the area she vanished from in northwest Bexar County known by authorities as a human-trafficking corridor. 

On the morning she vanished, surveillance video obtained by KENS showed Olmos standing near her vehicle with the lights on, while wearing only pajama shorts and a hoodie. 

Camila Mendoza Olmos, 19, told a friend 'I love you' over the phone the day before she vanished on Christmas Eve, her best friend has revealed 

Footage from a neighbor's surveillance camera showed an individual believed to be Mendoza Olmos standing near her vehicle with the lights on at 7am on Christmas Eve, and she hasn't been seen since 

In the footage, Olmos appeared to search inside the car for an unidentified item, investigators said. Moments later, the footage ends.

Her car was still parked at home when she disappeared, leading authorities to believe she left the area on foot. She has not been seen since.

The mystery deepened when it was discovered that Olmos, a Northwest Vista Community College student, had left her phone on a bed in her home with no battery, which was found by her mother around three hours after she was last seen in surveillance footage.  

Olmos's family said she typically goes for a morning walk, but always takes her phone with her, and insisted that it is out of character for her to leave without telling them where she would go. 

'It's just not Cami,' her aunt Nancy Olmos said. 'We knew something happened.' 

Another close friend, Isabela, described Mendoza Olmos's disappearance as 'very out of the norm.'