Apparently, she was told repeatedly to get up and leave and go to the office or whatever. After she apparently disrupted class and or violated some school policy.
Do the other students in the classroom not have the expectation of a calm classroom?
Yes. Perhaps the teacher and principal should have asked all the other students to assemble in the auditorium for continuation of class and prevented the unruly student from leaving the classroom...if she attempted to. If she attempted to leave, then let her....and close the door. Have the rest of the class stay.