If the ''older'' Isabelle Lagacé pled guilty and the younger Roberge not guilty, i have two theories.
First theory is the two girls disagree on how they should fight the accusations, one decided to plead guilty hoping for a short prison sentence and then come back here in Canada to restart her life.
The second one took the gamble to plead not guilty hoping the accusations will fall.
Which bring me to my second theory. Isabelle Lagacé, who at 28 is 6 year older than Roberge(22), possibly is the one who was fisrt recruited for this journey and then approched her friend Roberge to join her in this. Maybe she did not give all the details to her friend about what or how much they were going to smuggle.
She might now feel guilty about bringing her in this mess and decided to take all the blame. What's the use of being the 2 of them in jail if she can at least avoid a sentence to her younger friend.
A lot of Merb members had a tendancy to believe that Tamine was the mastermind or at least the middleman in all this operation and the 2 girls were paid like sugarbabies to accompany them.
My OPINION is that Lagacé was the leader of this trio. If Tamine was the middleman of a criminal organisation, they would tell him to plead guilty and spare the two young girls.
Tamine was 63 year old, living in a small appartment having as hard time to pay his rent. Roberge was relatively young at 22 compared to Lagacé 28.
Six years is not a big difference, but when you think about it, when Lagacé was 18 and clubbing, Roberge was 12 year old ! Lagacé who was a gutsy wowen, doing porn and working as a barmaid in clubs had a lot more life experience and met a lot more people, increasing the possibility she met bad persons in the drug business.