According to the reports:
Teacher Barbara Pietz said the girl earlier that day had stuck her hand in her classroom and sprayed Febreze air freshener. Pietz, who told police she has a fragrance sensitivity, said she closed the door to keep the odor out, but the girl came by and sprayed the room again.
In the next period, the girl arrived late for her class and refused instructions to go to her seat, instead sitting with friends, listening to music and disrupting the class.
The teacher called special education assistant Tammy Gue to the classroom for help. Gue, in turn, called in Mueller-Owens, who tried to guide the girl out into the hallway.
She eventually agreed to leave and told police that Mueller-Owens pushed her out the door of the classroom and started punching her. Mueller-Owens told police that as she was leaving the room, she tried to slam the door but he stopped it with his foot, and when he followed her out of the classroom, she started punching him.
A police officer who first reviewed video from a camera stationed in the classroom hallway said it was difficult to see what happened from the camera’s angle, but that it didn’t appear either the girl or Mueller-Owens started punching the other.