On Wednesday, Priscilla Schoolfield was arrested by state police and charged with third-degree child abuse.
Police were contacted on September 23 by the Indian River School District about the alleged assault that occurred on the bus.
According to investigators, a bus contracted for the district picked up a 4-year-old student at a bus stop on September 16.
As the student got off the bus, Schoolfield allegedly pushed the student to the back of the bus, forcefully shoved the student into a seat, and then struck the child, police said.
Police did not say if the student suffered any serious injuries.
Further details on the incident were not immediately released.