Horry County Police responded to Hallie Martin Road in Conway Friday morning after a bus driver complained about an incident with a mother, according to an incident report.
The bus driver told police a woman approached the bus and complained that her kids had been having trouble on the bus with other children, according to the report.
Police watched bus surveillance video, which showed the woman approaching the bus with a pistol by her side in plain sight.
Police charged Sandi Williams, 32, with Disturbing Schools and Unlawful Carry of a Pistol.
When police interviewed Williams, she told police she was holding her child's toy gun, but was not able to produce the gun for police, according to the report.