Friends and family have taken to social media to make tributes to the young woman described as "the greatest friend to so many" and "truly one in a million".
One friend wrote, "You found the best in every person and you loved everyone for who they were."
Another wrote, "I love you so much Harlee words will never be able to describe how much you meant to me and how much I'm going to miss you."
Symes was studying sport and recreation at the Southern Institute of Technology, and previously attended Menzies College in Wyndham.
A Southern Institute of Technology spokesman said a tutor and counsellor informed Symes' peers of the crash on Monday.
Classes were cancelled that day in respect to Symes and to give students and staff time to grieve. A test was also postponed to the following week.