Nora Quoirin's mother has asked the Government to back her in pressing Malaysian authorities for an inquest into her daughter's death.
Nora, 15, was found dead in the Malaysian jungle last year 10 days after disappearing from a resort where she was on holiday with her parents.
A major search and rescue was mounted for the London teen and she was discovered unclothed near to a river.
Her parents Sebastien and Meabh Quoirin believe their daughter's death could be suspicious, but were told that Malaysian authorities classified the incident as "no further action".
Ms Quoirin has called for the potential of criminality linked to her death to be pursued. She told BBC Radio 4 Today: "The criminal angles of this case, which we believe need to be absolutely prominent, were neglected in the beginning and we still need to return to that.
"Which is why we've broken, as it were, our silence and opened up our lives to seek the truth.
"What we really, really need is an inquest and in order to be able to get that we're going to need a consistent coordinated very audible call from our Governments to the Malaysian authorities in order to secure that."
Authorities in Malaysia said a post-mortem examination showed her death was caused by gastro-intestinal bleeding and an ulcer, due to starvation and stress.
They have alluded to Nora - who had learning and developmental disabilities - having wandered off and becoming lost, then dying of natural causes, though her parents insisted they could not support such a theory.
"As her mum and dad, we just simply cannot subscribe to any theory that she wandered off by herself," Ms Quoirin said, as she questioned how she could "possibly have got to where she was found".
In a previous statement, Nora's parents said: "The AGC's (Malaysian Attorney General's Chambers) decision prevents justice being done.
"As we have stressed from the beginning of this case, it is crucial to understand how Nora came to be found where she was.
"As a vulnerable child, with significant physical and mental challenges, we strongly refute any conclusion that Nora was alone for the entire duration of her disappearance.
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