I wonder if, in this case, the lack of evidence is evidence itself. It's sort of like the dog that didn't bark, or the classic locked room murder mystery. How does a high school student go missing for a month on a small island without there being a crime? In a country as large as the USA, I can see how someone can willingly disappear for a very long time. But on an island like Aruba, how long would she be able to keep up the ruse?
-PJ