Police at the scene had spoken to the rider, Mr Griffiths said.
"Early indications are it doesn't look like there's any fault on the part of the rider, but they've got work to do there."
Locals in Lake Rotoma, 40km east of Rotorua, said it was a popular holiday destination with many baches around the lake.
It was believed the family of the girl were from Whakatane.
The Labour Weekend holiday road toll of three is triple that of last year.
A 75-year-old Tokoroa woman died on Saturday after her car crossed a centre line and collided head-on with a truck.
The crash happened on SH1 at Lichfield around 1.50pm. Police were investigating the cause of the crash.
Keith Davies, 54, died after a crash at Dairy Flat, north of Auckland, less than an hour after the start of the official holiday period.
He was a passenger in a car that collided with a truck at the corner of Horseshoe Bush Rd and Dairy Flat Highway about 4.30pm on Friday. His teenage son Richard was at the wheel.
One person was killed on the roads last Labour Day weekend, 2013, police said.
This was the lowest number of road deaths recorded over a Labour Day weekend since records began.
There were, however, 83 reported injury crashes which left 20 other people with serious injuries, police said.
The official Labour Weekend holiday period began at 4pm on Friday and ends at 6am tomorrow.
The Rotoma was one of two crashes on State Highway 30 last night.
Patients from a Braemar Rd crash had to be taken to Rotorua Hospital by road.
Police said diversions were in place for the Braemar Rd crash via Kawerau.
Meanwhile, a milk tanker and car crashed near Lake Rerewhakaaitu.
The crash happened around 7.01pm on Brett Rd, near Lake Rerewhakaaitu.
There were two people in the car but no one was injured, said Inspector Willie Taylor from Police North Communications.
He said all involved were "shaken" but otherwise unhurt.