The woman is charged with murdering two of her children

Police will reportedly allege Crabtre slowly poisoned them over an'extended period

Gold Coast woman Maree Mavis Crabtre, 51, was arrested on Wednesday morning over the deaths of her 18-year-old daughter and 26-year-old son, who were originally thought to have committed suicide.

She was allegedly responsible for killing her son, Jonathan Crabtree, whose body was found at an Upper Coomera home in July past year.

"These acts haven't been compassionate acts of a stressed mother at her end", he said after her arrest.

The body of her teenage daughter was allegedly found at a Maudsland home on September 4, 2012, where Crabtree was living at the time.

The survivor was known to Crabtree and spent "extensive" time in hospital as a result of her "significant" injuries, according to police.

She has also been accused of attempted fraud over a superannuation death benefit policy valued at $125,000 and a fraudulent permanent disability claim of $238,800.

Police said the children's health and wellbeing was "impacted" prior to their death because of their mother's actions and guidance.

The woman was also charged over the alleged torture of a 25-year-old woman, who police say was seriously assaulted on numerous occasions over several years.

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Following a protracted and complex investigation, the 51-year-old was today officially charged with two counts of murder.

Before and after Erin's death, Crabtree allegedly received about $458,396 (AU$567,863) from two insurance claims meant for the care of her children.

Inspector Thompson said police would allege Maree Crabtree "counselled" her son to rob the store, while he was armed with a knife.

Crabtree and her family moved to Queensland in 2011.

Thompson appealed for information relating to the alleged crimes, which are said to have taken place across Australia.

Crabtree was remanded in custody and her matter is set to return to court on February 12.

Insp Thompson said the investigation had been complex because numerous alleged incidents took place in different parts of Australia.

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