A 20-year-old Dreamworld instructor who trained a young ride operator on the day four people were killed on one of the theme park’s rides has been promoted since the tragedy, and now undertakes compliance audits, a court has heard.

Amy Crisp is giving evidence at an inquiry into the deaths of Kate Goodchild, Luke Dorsett, Roozi Araghi and Cindy Low on the popular water ride at the theme park in October 2016.

The group was killed when two rafts collided at the base of a conveyor after a large water pump feeding the ride failed and a vessel got stranded.

The court has previously heard if an emergency e-stop button had been pressed at the unload area near junior employee Courtney Williams, the tragedy could have been avoided.

On Ms Williams’ first shift operating the ride, Ms Crisp trained her for 90 minutes.

Ms Crisp was 19 years old when she was employed by Dreamworld, and became a level one ride trainer at the age of 20.

Ms Crisp conceded her progression from a ride operator to trainer was quicker than average but thought it was fair.

Amy Crisp arrives on Wednesday for the inquest on the Gold Coast. Photo: AAP

The court heard beforehand she had been a waitress and worked at Subway.

Ms Crisp was promoted two months after the Dreamworld tragedy from a trainer to a full-time supervisor.

Inquest: What we’ve heard so far

The coronial inquest into the fatal Thunder River Rapids accident has heard staff were over-stretched and under-prepared for serious incidents.

Under cross-examination from barrister Matthew Hickey, for Cindy Low’s family, Ms Crisp said she now performed audits on other ride operators.

“I am one of the training and compliance officers and I go and do some of the audits,” she said.

The court heard Ms Crisp spent 90 minutes training Ms Williams on the Thunder River Rapids ride the day of the fatal raft collision and the junior employee had to read a 14-page manual before signing off on the document.

“I knew when someone was not understanding something,” Ms Crisp said.

“There were no flags raised [about Ms Williams’ understanding] … nothing set me off, nothing alarmed me.”

Mr Hickey told Ms Crisp the court was now left to rely on her “say so” that Ms Williams was properly trained the day four people were killed because there was no recorded documentation of any testing of Ms Williams’ knowledge.

-ABC