The trio used the 51-day cruise from the United Kingdom through Latin America and New Zealand before arriving in Australia to transport more than $22.5 million worth of cocaine.
Lagace said she tried to smuggle the drug shipment after receiving an ultimatum on the cancellation of a $ 20,000 debt with an unidentified person.
The two women were arrested along with Tamine - a Montreal-based loner with no family.
Judge Kate Traill said she could not be satisfied beyond a reasonable doubt that Legace went on the trip because she had been threatened, telling the court her claims were "vague" and "imprecise".
Lawyer Ragni Mathur argued Ms Roberge was unaware of the cocaine in her friend's luggage, despite it being in the cabin they shared.
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The bust made global headlines not just because of reports that the haul was worth $30 million, but because readers around the world wanted to gawk at the trail of Instagram pictures where Roberge showed off the good time she was having in different sun-drenched locales.
DailyMail.com reports that Roberce's father anxious about his daughter when she said she was embarking on a two-month round-the-world cruise, which ultimately ended with her arrest in Sydney.
However, Ms Lagace and Mr Tamine had booked their cruise - which visited Colombia, French Polynesia Chile, Peru and New Zealand - together, Ms Mathur told the court.
Roberce and two other accomplices were found with up to 95kg of cocaine on board the Sea Princess after it arrived at the Overseas Passenger Terminal in August 2016.
A suitcase filled with cocaine after it was seized by customs onboard the MS Sea Princess in Sydney, Australia.
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Drug trafficking laws in Australia are especially stringent, and people found guilty of drug smuggling can spend up to life in prison.
Nearly 30kg of cocaine allegedly found in a suitcase in the girls' cabin. Once they docked in Sydney, the were greeted by border agents, sniffing dogs and the Australian Federal Police, who were tipped off by Canadian and American sources who saw her making moves on the 'Gram.
A prosecutor called the cruise ship "a floating warehouse" for drugs with the three Canadians as minders for the hidden cargo.
The cocaine was stored beneath the beds of the travellers.
"You don't need two chickens to keep warm a golden egg", she said.
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