From the AP:
OMAHA, Neb. (AP) -- A former teacher accused of having sex with a 13-year-old student said it was the boy's idea to flee to Mexico and that he told her he would kill her if she left him. [...] Peterson said the boy left bruises on her arms and chest, told her what to wear and threatened her life. She said he was in a gang and had her name tattooed across his chest, and that the boy's family knew about and encouraged their relationship. [...]
Peterson, who has been fired from her job as a middle school teacher and basketball coach, said she left with the boy after school officials started investigating their relationship. She hoped rumors about them would blow over. "I really thought it just might go away," Peterson said. "And I know that sounds crazy, but that's what I thought." But the school called police, and authorities including the FBI started searching for the pair.
Either Kelsey Peterson was a kidnapping victim or she wasn't. Leaving town with a 13-year-old in the hopes that the rumors would end isn't any type of kidnapping I've ever heard of.