I honestly don't think that little girl could've just vanished. I definitely think people are hiding things whether it be her parents, the police, official authorities etc. She went missing in another country, someone MUST have seen something. If she's dead how has no body been found yet? Something has definitely been covered up very well. To be honest it would be almost impossible to find her now, 9 years have passed - she would look considerably different now (if she's alive).
Also at the time this story was so publicised, her face was everywhere, I find it hard to believe that nobody knew anything.