Maintenance Controller reported a rejected takeoff caused by a takeoff configuration status message for rudder trim. The flight crew failed to return to the gate for a maintenance inspection and departed.

Narrative

Aircraft X had a low speed rejected takeoff for takeoff configuration status message for rudder trim. I mistakenly did not realize that it was a Company event and they needed return to the gate for a rudder trim inspection; due to the rudder trim being at fault.Maintenance Operations Manager made we aware of the event and we tried to stop the aircraft from taking off; but we were unable to get them on ACARS in time.I was unaware that it was a Company event and I was reading the QRH CRJ-700 with the crew and the note said NOTE:After any RTO (Rejected Takeoff) greater than 80 knots; the crew must seek approval to continue from a Chief Pilot; Fleet Manager or Director of Operations.The best method to facilitate this communication is through Dispatch.All RTOs will be documented with a Safety Report. The speed that the crew said was only 50 knot when they performed the rejected takeoff.My mistake was just consulting the QRH and not the GMM (General Maintenance Manual) for the definition of a [event].