Army can arrest all those involved without the commission route, and that includes the PM's daughter. Commission was a compromise by Army to avoid a major political fallout and not a constitutional requirement for army to make arrests and prosecute.
It only happens in Pakistan where a sitting PM's daughter is directly involved in fabrication of news and breaching national security.
Army has every legal right to reject such notifications when they already have constitutional cover to arrest and prosecute those involved whether the PM approves or not.