Someone witnessed the fight at a Flower Mound park and contacted police, Dallas-Fort Worth television station KDFW reported.
Reagan and Desiree returned to their home where officers arrived and made the arrest.
Lt. Clay Pierce with the Flower Mound Police Department told the station it was a case of family violence and state law required them to take some type of action.
Both girls had injuries, but Desiree’s appeared to be more serious, the station said.
Rhonda Green, the girls’ mother, said that she does not know how Reagan was “scarred” by being arrested.
Source: The Brownsville Herald