According to the police report provided to BuzzFeed News, a large crowd had gathered around the officers at the party.
"The crowd got upset with witnessing our actions and they all appeared to be on the verge of interfering," the police report said.
Police said that the teen's mother, who was upset over someone assaulting her daughter, was pulled over to the side by an officer and asked to calm down.
The teen's brother took off his shirt and began "acting very aggressive," the report said. He looked up at one of the officers who handcuffed him and said, "I'm going to kill you," according to the report.
Police also handcuffed their mother but later released both her and her son.
Only her teen daughter was arrested.
The report did not indicate that she had been struck by any of the officers.
Her lawyer, Artessia House, denied that the teen struck the officer. House told the San Antonio Express News that the teen was an honor-roll student with no history of violence. She said that one officer in the video could be seen "clear as day" striking the teen.
House did not respond to BuzzFeed News' request for comment.