Lawyers for Maria Elvira Pinto Exposto say they are confident the Sydney grandmother's conviction for drug trafficking and her death sentence will be overturned in Malaysia's Court of Final Appeal.
Her appeal for trafficking more than one kilogram of crystal methamphetamine, also known as ice, through Kuala Lumpur International Airport in 2014 will be heard on Tuesday.
"We're very confident. We have always maintained that the facts have always been as Maria said," her lawyer, Muhammad Farhan Shafee, said on Monday.
Exposto, 55, was initially found not guilty in a lower court after it heard how she was set up in an online boyfriend scam by a man who identified himself as "Captain Daniel Smith," a US soldier stationed in Afghanistan.
They arranged to meet in Shanghai but he failed to turn up.
Instead, Exposto befriended a stranger and she testified that he had asked her to take a black backpack, which she thought contained only clothes, to Melbourne.
During a stopover in Kuala Lumpur, customs officers found the packages of meth hidden inside the lining of the bag.
She was charged and the court believed she had been an unwitting drug mule but prosecutors appealed, won and she was sentenced to death early last year.
Her final appeal has been complicated by changes in laws governing executions.
Use of the death penalty is currently suspended and legislation is pending that will make it no longer mandatory for the courts to impose the death sentence on traffickers.
Whether to send convicts to the gallows will be left to the discretion of the judges.
Mr Shafee said her appeal would focus on legal technicalities and the defence would argue the lower court that found her guilty had erred in their judgement.
