A police press conference, due on Wednesday, is now expected to take place at an as-yet unspecified time on Thursday.
The post-mortem examination of Nora Quoirin has shown no evidence of abduction, with officials saying her death was likely caused by prolonged lack of food and stress.
'There were some scratches on her arm and some bruises but otherwise there were no injuries'.
Authorities will conduct more tests with samples sent to the Chemistry Department.
Nora was born with holoprosencephaly, a neurological disorder, which limited her speech and coordination and made her "very vulnerable", according to her parents.
Police believe Nora may have become lost after wandering off from the villa her family were staying in at the Dusan eco-resort. "The cruelty of her being taken away is unbearable", the family said in a brief statement issued by the Lucie Blackman Trust, a charity that helps families of Britons in crisis overseas. "Our hearts are broken".
It was volunteer helpers who found the body.
"She had been dead for the past two to three days".
The results of the post-mortem found no indications of sexual assault while there is no suspicion of foul play "so far".
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The area had already been scoured by searchers, leading ta source close to the investigation to ask if she'd been taken and "moved to the area" before she was found. However, national deputy police chief Mazlan Mansor told reporters they were looking into all possible angles, including the "angle of criminal investigation".
During the 10-day search fundraising pages set up by Nora's aunt and uncle raised more than £100,000.
A book of condolence was opened on Wednesday at the city hall in Belfast, where Mrs Quoirin is from, with Lord Mayor of Belfast John Finucane the first to sign it.
The couple identified her body at a hospital and were today comforted by relatives who had flown to Malaysia.
Sankara Nair, a Malaysian lawyer for the Quoirins, said they are "highly traumatised following the loss of their child". "They are in a state of shock".
"Nora can read like a young child, but she cannot write more than a few words".
Nora has been missing for a week, with hundreds of rescuers still involved in the search operation.
The jungle is home to an array of potentially harmful animals, including snakes, insects, tigers and wild boar.