[proxy_user]

Sometimes, the improbable happens.

She could have woken up at six, remembered leaving something outside, and impulsively run out to pick it up. At the very same moment that she went out, X just happened to be passing by. He had no intention of committing a crime, he was just jogging or collecting the trash or something, but...

[Graymatter]

More probable than her randomly running into a kidnapper---maybe the would-be abductor befriended her, told her there was a group of kids going on a free trip to Disney World or wherever, or to a surprise party for her grandparents. Something she was supposed to keep secret from them. Then the kidnapper doesn't have to leave any DNA on the premises. Kids are very gullible.
They should ask her friends if anybody's got a "phone friend" that none of them has ever met. It's not always the computer.