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WILMINGTON -- The mother of missing New York teenager Brittanee Drexel made an appearance on the "Today Show” Friday morning, nearly a year after the 17-year-old vanished from a Myrtle Beach hotel.

They revealed new cell phone video taken the day before Drexel disappeared. A signal from the teen's phone in Georgetown, S.C., is one of the last big clues.

Authorities have three to four persons of interest in the case.

"There's only three possibilities that I think that would have happened to Brittanee,” her mother, Dawn Drexel, said. “She is either being held against her will, she's been trafficked or she's not alive."

A march and candlelight service are planned for Drexel next Saturday in Myrtle Beach. The Wilmington-based Cue Center for Missing Persons has been working with Drexel's family to try to locate the missing teen.

Crime Stoppers is offering a reward for any information on Drexel's whereabouts. Anyone with information should call 1-888-CRIME-SC.