A chance viewing of "America's Most Wanted" on television confirmed the manager's suspicions that Oliver was up to something. Immediately after recognizing Oliver's photo on the show, calls were placed to law enforcement and the FBI.
Authorities who raced to the hotel knew who Mullenberg was, but after months in captivity, Mullenberg did not. Only after authorities showed Mullenberg pictures from her past did she come back to reality.
Lukasavige remembers when she got the call from the FBI saying her daughter had been found. "It was just the most profound happiness I've ever felt in my life," she said.
Mullenberg had survived the ordeal, but another fight began once she got home -- a fight for acceptance and a fight against criticism and self-doubt.
She began to rebuild her life, going back to school, rekindling friendships and relationships, and dealing with an array of psychological and physical problems.
Lukasavige said, "She used to be [a] very upbeat and loving child to be around, and happy. And now, you can tell that she's depressed, and day-to-day life is hard for her."
Mullenberg, now 27, is telling her story -- a rare look at abduction from the victim's perspective -- in the hope that families and other victims will gain understanding.
"Trust [was] a big issue," she said. "[I knew] it was going to take awhile to open up and trust people again."
Mullenberg received a degree with honors from the University of Wisconsin and has plans to marry her longtime boyfriend, Curt Christianson.
Oliver is serving a 40-year sentence in federal prison.
She and Christianson would like to have their own family, but Mullenberg admits that while she may seem functional to the outside world, her wounds are still deep.
The abduction left her with a kind of life sentence.
"It's like I live two lives. That's how it's been since I was returned at 13," she said. "There's always the Mullenberg who was kidnapped part. And then there's the other one where, you know, I finished college and I'm working and I'm trying to go forward, but everything is being pushed back because of the kidnapping. So even though he's in jail, he still controls my life because I can't go forward."