The search for Melodee Buzzard began on October 14 when a school administrator reported the 9-year-old had been absent for a prolonged time.

The investigation into her whereabouts has now stretched for nearly a month, focused on a 1,000-mile road trip from California to Nebraska, and has led to the arrest of her "uncooperative" mother, Ashlee Buzzard, on a false imprisonment charge unrelated to Melodee's disappearance.

The mother appeared in court Wednesday and pleaded not guilty. She was released on bail with a GPS device.

Law enforcement sources told ABC News that they are investigating all possibilities in the case, including that Melodee was trafficked. The sources say there's no specific evidence pointing to her being trafficked, but that it is one of the angles they are investigat

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