Officials are still unable to explain how 15-year-old Nora Quoirin died with a cause of death still not established.
The post-mortem examination is now set to continue for a second day.
Matthew Searle of the Lucie Blackman Trust, who is representing the family, said: "The post-mortem is ongoing, therefore no conclusion has been reached yet."
He also appealed to people not to speculate on what happened to the London teenager who went missing on August 4 from the Dusun jungle resort in Malaysia.
A police press conference, which had been due to take place on Wednesday, is now expected to take place at an as-yet unspecified time on Thursday in Malaysia.
The body of the 15-year-old girl, who had special needs, was discovered beside a small stream near a waterfall close to from the jungle resort of Dusun on Tuesday.
Nora had reportedly been excited to go and see the waterfall on her arrival on the family's two-week holiday at the eco-resort.
Prior to the results, representatives of her parents said they had "questions" following the search teams finding the teen and the examination would guide their next course of action.
A pathologist was seen entering the Tuanku Ja’afar Hospital at around 9am local time on Wednesday, with the post-mortem beginning at 10am.
Earlier in the morning a source told local media that police officers were waiting to see whether there could have been criminal involvement in the teen's death.
Its results would then determine the next steps from authorities and Nora's family, reports added.
According to The Star in Malaysia, the family has taken on a lawyer to represent them, who indicated he may push for an inquest following the post-mortem.
“The family expects the police to do a thorough investigation into the incident, including criminal angles,” their lawyer, Sankara N Nair, said, according to the Irish Times.
He said that if the post-mortem does not clearly determine how she died, the Malaysian government could hold an inquest into her death.
The family's spokesman previously said her relatives had a number of unanswered questions in regards to her disappearance.
The teenager's parents, Meabh and Sebastien Quoirin, a French-Irish couple who have lived in London for 20 years,
Previously, Mr Searle told the Sun: “One of those questions is, has the body been there all the time or is there a criminal involvement? Was the body dumped there afterwards?”
They also want to know how it was the search teams missed her body when they first combed the area near a waterfall where she was found.
Meanwhile, a hiker has described how Nora looked “like she was sleeping” when she was discovered lying close to a stream.
Sean Yeap, a volunteer taking part in the search for the 15-year-old, told Mail Online: “It looked like she was sleeping. Her head was resting on her hands. But we all knew she was dead.”
He detailed that that Nora’s body was not hidden or covered over with foliage, which could raise questions over why teams that had previously searched the area were unable to find her.
Mr Yeap, an insurance salesman, believes search teams passing through the area would have found it, had it been there and said: “The place where she was found is not easy to find. I wonder if she had been following the stream as there were no footprints which means she could have been walking in the water as it was not very deep.”
Nora's body was found following a large-scale operation to find the Irish teenager, who disappeared from the resort on Sunday, August 4.
Following the discovery, a statement from her family said: "Nora 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 Nora."
The statement added: "We would like to thank all the people that have been searching for Nora 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.
"Nora 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."
Previously, deputy police chief Mazlan Mansor told reporters at a press conference that the remains were winched by helicopter to a hospital mortuary and added that the body "was not in any clothings".
He said then that while it remained a missing persons case police were looking into all possibilities including the "angle of criminal investigation".
Local media reported that a forensic team also went back to the area where the body was found to comb for evidence. Police didn't say how long the body had been there or why rescuers apparently missed it earlier in the search operation.
Police from Ireland, France and the U.K. are in Malaysia to assist in the investigation. The girl's mother is from Ireland and her father is French, but the family has lived in London for 20 years.
Police believe the teen climbed out through a window in the living room of the family's resort cottage.
They listed her as a missing person but said the investigation included possible criminal aspects. The girl's family has said she isn't independent and wouldn't wander off alone, and was likely to have been abducted.
The headteacher at Nora'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.
"Nora 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 Nora.
"We will be working hard to support our other students and their parents and carers. Our thoughts and prayers are with Nora's family."