stephanie scott , an english and drama teacher , was last seen on easter sunday .
at 12.59 , 550 km west of sydney , at 11 am on easter sunday .
at 12.59 pm on sunday afternoon she sent an email from the school to a bus company arranging transport for guests for her upcoming wedding this saturday .
ms scott 's parents plan to hire a helicopter to join the desperate search for their daughter , as they fear her disappearance has something to do with ` her car or foul play ' .