The Community Affairs Department says inspectors have yet to determine what caused the incident on the Wisdom Super Sizzler which took the life of Hailey McMullen of Deerfield Township.
She was ejected from the ride and taken to a hospital, where she died.
NJ.com reports state inspection records show the ride was in full compliance in April. Earlier reports found some electrical repairs, a restraining bolt that needed to be replaced and missing permit stickers.
The ride's operator claims there was never a major incident involving the ride in its 27 years of operation.
Information from: NJ.com