The woman reportedly suffered a head injury and was pronounced dead on arrival at Denpasar Hospital.
Forensic doctor Ida Bagus Putu Alit said that Martini had also suffered very bad leg injuries in the crash.
Her boyfriend Steele Nugent, 28, was not badly injured in the crash.
Ms Martini had been working as a trainee at Townsville City Council since May and was completing a Certificate II in conservation and land management.
Dozens of states sign nuclear weapons ban treaty at United Nations
He called the pact "an important step towards the universally-held goal of a world free of nuclear weapons". French Foreign Minister Jean-Yves Le Drian said Monday it can only weaken the nonproliferation treaty.
A friend Trina Hurst, shared an online tribute for Ms Martini, whom she called an "angel" who "lost her wings".
Sophia Martini, from Magnetic Island, was riding as a passenger on her boyfriend Steele Nugent's scooter in the early hours when it was involved in a crash in Kuta.
Last year, 16-year-old Lochie Connaughton and 42-year-old Adrian Newon died just a month apart, both in scooter and motorbike accidents.
A Department of Foreign Affairs and Trade spokeswoman confirmed it was providing consular assistance to the family of a woman who died in a traffic accident in Bali and a man detained after the accident.
A Queensland woman has been killed in Bali after falling off the back of a scooter.
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