A social workers report and plan will be prepared ahead of sentencing.
The five teenagers, who were all high school friends, were travelling in a Nissan Tiida after visiting a nearby camp site.
It's understood that the car had been travelling at 111km/h on Harts Rd when it hit a grassy mound, which launched the car across Southbridge-Sedgemere Rd into a macrocarpa hedge.
The only occupant wearing a seatbelt managed to flag down a passing motorist who phoned emergency services.
Just days after the crash, Lily's father Marcus Moore said he had forgiven the 14-year-old driver, and wanted to encourage other youngsters to make good choices in life.
"He's a good kid. He has to live with it for the rest of his life and we have to grieve for the rest of our lives," Moore said.
Nineteen people died on New Zealand roads over the Christmas and New Year period.
