You also think that a "severely mentally handicapped" half naked, barefoot 15 year old who "can't even brush her own hair" was able to survive independently in rugged jungle terrain for over a week AND managed to find her own way to the waterfall. I'm not really very impressed by what you think tbh.
In fairness, and I know almost nothing about this case and don't intend to learn, but being found 1.6 miles from the base, in a clear state of malnourishment, I doubt foul play is a factor. Water is not a problem in the jungle, neither is food, but it's obviously alive with all sorts of harmful shit, any of which she may have come in to contact with.
I'd expect a fully cognisant adult to last weeks in the jungle if they don't have an accident, receive a toxic bite or eat some poisonous shit.
A vulnerable, mentally impaired, semi-clad child? Days.
*edit: depending on the time of day, walk 10 metres in to the primary jungle and you could find any lights shining externally will probably not be visible.