Manning is charged with misdemeanor assault.
She spent more than 24 hours locked up before she was released.
The 33-year-old Manning is best known for playing Eminem's ex-girlfriend in the 2002 movie "8 Mile."
Her lawyer, Joseph Tacopina, says Manning and the assistant got into a confrontation but it was not an assault. He says it was "a little misunderstanding between the two."
Manning is due back in court Nov. 13.
Information from: New York Post