"I know it might sound hard to believe, but I didn't have that conversation with Lisette that would go something like, When were you going to tell me that we're smuggling drugs? This is illegal."
"I was very afraid," she continued. "She said she had private investigators [and that] she had a hit man on speed dial. We were drug dealers, and we were dealing with other drug dealers."
The drug runs continued. But her flights with her BFF were about to land her a date with the DEA.
During one trip, Cady said, "I looked up and I saw 30 or so DEA agents, and I looked to my right, and there was a machine gun aimed at my face."
Investigators discovered 500 pounds of marijuana. Cady and Lee were detained and questioned. Over the next few months, investigators learned that all the trips -- many involving Cady -- moved over 7,000 pounds of marijuana worth more than $3 million.
Her faux friend had also been playing a role, Cady said.
"I found out she had been lying about a lot of things," Cady said. Those things included her age, her relationships with stars, her private school background, that pop star career.
As for that Samsung connection, the company denied any relation to a Lisette Lee.
"I felt like an idiot. I was completely duped. She lied about everything. ... And I was looking at five to 40 years in prison," Cady said.
Lee and Cady pleaded guilty to conspiracy to distribute marijuana. Lee is serving a six-year sentence in a federal prison. Cady, who cooperated with authorities, was sentenced to one month in prison followed by a year of house arrest.
What would Cady want to say to Lee?
"I don't have anything I want to say to her. ... Ultimately, the consequences that I ended up suffering came from my own bad decisions, and I just have to move on with my life and try to have a good one."
But as we've seen over and over again, in Hollywood, bad decisions can sometimes pay off.
Cady has a mug shot, and had to wear an ankle bracelet -- but she blogged about it at housearrestgirl.com. The blog landed her a book deal. And Paramount Pictures is turning the whole story into a movie.
Maybe Cady isn't so naive after all.
Watch the full story on "20/20: The Ultimate Betrayal" TONIGHT at 10 ET.