Footage released by the police showed officers raiding a house in Toowoomba early on Tuesday and arresting 12 people inside.
Elizabeth's sister Jayde Struhs, 24, has spoken out against her parents' religious group.
The oldest of eight children, Jayde Struhs said she left home to distance herself from her parents and the group at age 16 when she realised she was a lesbian.
The group did not celebrate Christmas, believed members' sole purpose was to serve God and did not accept medical intervention, she said.
"No outside help, no medicines, no Panadol, no doctors, dentists, anything," she said in an interview. "It was all 'God will heal.'"
She added that the group said they had no name and just declared themselves to be "the people of God or Jesus".
She described her sister as a "really bright little 8-year-old" who loved pranks, and said she was diabetic and required insulin. The police have not specified the untreated medical condition that led to Elizabeth's death.
Members of her extended family were "shattered and heartbroken" when they learned of the death, Jayde Struhs wrote in a GoFundMe she started after Elizabeth's death to raise money to support her other siblings.
"We have faced the brutal reality that the people who should have protected her did not, and we may never know the full extent of what took place," she wrote.
Charging 14 people with murder over the death of a single child was highly unusual, Watts said. "I certainly haven't seen it in my almost 40 years of policing."
This article originally appeared in The New York Times.
Written by: Yan Zhuang
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