teacher 's students at coutts crossing public school on nsw north coast hold on to the hope the mother-of-three will turn up to school again one day , the police focus has shifted to treating the teacher 's disappearance as a homicide .
ms edwards was last seen on march 14 , after she caught up with friends at the local good intent hotel .
investigators , including forensic officers and the dog squad , returned to her home in grafton on monday with a crime scene warrant .