She was last seen on May 28 in Crestline, Ohio.
Authorities believe the girl is with her mother, Candace Watson, and Robbi Potter, a registered sex offender who escaped from a halfway house in Richland County.
According to investigators, surveillance video recorded May 31 at a Wal-Mart in Marion showed Watson inside the store while Potter stayed outside, Westbrook reported.
The video was recorded shortly before 3 p.m.
Surveillance video also shows what appears to be a child in the pickup used by the couple, Westbrook reported.
The pickup is a blue, 1988 Chevrolet with Ohio license plate number DNS9729.
Assistant Chief Deputy U.S. Marshal Drew Deserto said authorities were offering a $10,000 reward for information leading to Potter's arrest.
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Previous Stories:
June 12, 2009:
Missing Girl's Uncle Speaks About Case
June 11, 2009:
Nationwide Search Under Way For Missing Girl
June 11, 2009:
3 Arrested In Connection To Missing Girl
June 9, 2009:
Alert Issued
For Missing Girl, 4
