Here's the latest article about her on CNN.com for those who haven't heard.
My theory: She met someone (online or somewhere) and rather than break off her engagement like a normal person, she decided to runaway with the new person. So she changes her hair and hops a bus to rendezvous in Las Vegas. Only something went foul with the rendezvous (either the person she was meeting didn't meet her expectations, or she didn't his/hers, either way someone wanted out) so she had to go back to Plan B, AKA the dude she was supposed to marry. But she can't go back without an explanation that doesn't lay the guilt on her, so she concocts the kidnapper story...only she's in way over her head at this point since her actions indicate premeditation. Whoops.
Why do people insist on taking the hard way out, creating layer after layer of deceit? Wouldn't it have been simpler and kinder to all involved to be honest and say, look, I have doubts/cold feet, let's postpone? Her poor family. All the quotes from the family & church friends have been pretty kind to her; I think it was a town member who said he was glad she was safe but that this was an act of the most extreme selfishness. I agree. I hope the district attorney sends her the bill, and I hope her family makes HER pay for it (and the wedding bills).