I'm not even going to ask you for your source, because that is just incorrect.
There are three types of kidnappings.
Family kidnapping 49%
Acquaintance kidnapping 27%
Stranger kidnapping 24%
The family has been cleared. So we can eliminate that possibility. That leaves the other possibilities: acquaintance (53% chance) and stranger (47% chance). For the most part I think her acquaintances have been cleared. They probably have some more investigation to do into that, but I'm sure a lot of acquaintances have been cleared. Which pushes the odds of the kidnapper being a stranger way up.
Thursday Edition: Kidnapping Facts