Could her being found naked be due to paradoxical undressing related to hypothermia? Especially if she went into the water as i understand it you're at a much higher risk of contracting hypothermia from being wet. Of course the problem with that is how hot Malaysia is this time of year but it may have been cold enough at 3AM or whenever if that's when she left.
Sorry i'm sure there's a lot wrong with this, i'm not up on all the facts as i haven't had the chance to follow this properly. Sad as hell, was holding out hope she'd be alive but that was very unlikely almost immediately considering her special needs and the fact she would've entered a jungle or worse been abducted. RIP