CNN reports. She “faces child endangerment and contributing to the delinquency of a minor charges, police said,” but she could also be prosecuted as an aider and abettor of the underlying battery by the son. (Encouraging someone to commit a specific crime, including when the crime is in progress, is a form of aiding and abetting.)
A video of the fight “was posted on YouTube and police say they learned about it from a tipster.” Note that encouraging a child to act in lawful self-defense, or instructing the child how to better defend himself, would not be a crime; but from the story there’s little reason to think that this is what the mother was doing.