I think the Malaysian authorities have behaved entirely correctly in this case. Both the police and the courts have relied on the evidence available to them. The family had to acknowledge that there was no physical evidence to aid the coroner. They said;
“The verdict focused exclusively on physical evidence and physical mobility – which we believe, presents a very incomplete/select theory on how Nora came about her death.”
LBT Global said;
“It is clear that Nora could not have physically carried out the movements suggested.
“It is crucial that to deliver a comprehensive verdict the coroner would have to have fully taken into account Nora’s condition – that they did so is not immediately apparent."
It may be clear to the family that Nora's condition prevented her from doing what it seems she did; leaving the accomodation and wandering off, but it seems they failed to convince the authorities. I wonder if they had medical testimony to support their belief? Did Nora's doctors testify about her physical capabilities?
https://www.thenational.scot/news/uk-news/18984097.nora-quoirin-inquest---family-disappointed-verdict/