She was released after posting bond.
Parents and students at Lexington Middle were equally shocked by the arrest.
"She's responsible for other people's lives, and she's driving a car where my kids are walking, and other kids," parent Katie Lindsay told WBBH. "Just (a) lack of responsibility."
Sara Millican, 13, told WFTX that the incident was "crazy."
"People come to school to learn, and not to see people doing drugs in their cars," Sara told the news station. "Like, why would anyone do that? Especially when there's kids of all ages here."
It was not immediately clear if Hester is the parent of a child or children at the school.