The video shows two young children fighting in an alley and someone off-camera is heard encouraging them to fight.
Police were called on May 9 to investigate the video that had been posted to Facebook.
They say they identified the two boys, who are seven and nine, and say they were not seriously injured in the fight.
Daralee Jewel Klyne, who is 18, is charged with assault.
She is to appear in court on July 22.