The post-mortem examination on Nóra Quoirin's body is continuing and the results have been delayed until Thursday.
A cause of death has not yet been established, Matthew Searle of the Lucie Blackman Trust has said.
"The post-mortem is ongoing, therefore no conclusion has been reached yet," he told Press Association.
He also appealed to people not to speculate on what happened to the teenager who went missing on August 4 from the Dusun jungle resort in Malaysia.
He said: "There will be a time for comment but that time is not now. Let the family grieve in peace."
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A police press conference, which had been due to take place today, is now expected to take place tomorrow in Malaysia.
Belfast Lord Mayor John Finucane has announced a book of condolence will be opened at Belfast City Hall today following Nóra's death. Nóra's mother, Meabh, is from Belfast.
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The headteacher at Nóra's school in Wandsworth, south-west London, paid tribute to her as someone who was "a delight to work with" and said her fellow pupils and others who knew her there will be supported at such a difficult time.
Mike Reeves said: "The Garratt Park School community is deeply shocked and saddened by this awful news.
"Nóra was a delight to work with, and focused very hard on making the best of her abilities. We are a small school, so most of our students knew Nóra.
"We will be working hard to support our other students and their parents and carers. Our thoughts and prayers are with Nóra's family."
In an emotional statement, Nóra's family said their their "hearts are broken" and offered thanks to those involved in the search for the 15-year-old.
Her body was discovered on Tuesday beside a small stream, about 1.6 miles (2.5km) from the jungle resort of Dusun, where the family were staying.
Describing how the teenager had "truly touched the world", her family said: "Nóra is at the heart of our family. She is the truest, most precious girl and we love her infinitely.
"The cruelty of her being taken away is unbearable. Our hearts are broken.
"We will always love our Nóra."
The statement added: "We would like to thank all the people that have been searching for Nóra and trying their best to find her.
"We thank the local people here and those far and wide for their prayers and support at this time.
"Nóra has brought people together, especially from France, Ireland, Britain and Malaysia, united in their love and support for her and her family.
"To all our friends and family at home, we can't thank you enough for all your love."
Nóra, who was born with the brain defect holoprosencephaly, disappeared on Sunday August 4 while on holiday with her family.
Hundreds of people were involved in the search and rescue operation and it was volunteer helpers who found her body.