Qld mum faces 'life sentence in her heart'

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Mourners visit the burial site of eight children, aged two to 14, following a memorial service at the Martyn Street Cemetery in Cairns, Saturday, Jan. 10, 2015. Raina Mersane Ina Thaiday, 37, mother of seven of the children and aunt to another, was charged with eight counts of murder allegedly committed on December 19. (AAP Image/Dan Peled)

A Cairns mother deemed of unsound mind when she killed eight children has a "life sentence in her heart" if she ever grasps her actions, the law society says.

A Cairns mother who killed eight children will serve a "life sentence in her own heart" if she's ever able to grasp her actions, the Queensland Law Society says.

It was revealed on Thursday that the Mental Health Court has found Raina Thaiday was of unsound mind at the time and won't face prosecution over the December 2014 deaths of her seven children and a niece.

Justice Jean Dalton said there was a convincing body of evidence Thaiday suffered a psychotic episode and had no capacity to control or understand her own actions.

"To her way of thinking at that time what she was doing was the best thing she could do for her children, she was trying to save them," Justice Dalton said.

QLS president Christine Smyth said it was "very" rare to prove someone was entitled to the defence and the court would not have reached its decision lightly.

"She has a life sentence in her own heart if she ever learns to understand what it is that has occurred and the gravity of the circumstances," she said in Brisbane.

"It is not something that any parent wants to know they've done."

Ms Smyth said the material suggested Thaiday was struggling to respond to some medication and it was likely she would be under treatment "for a very long time".

Thaiday, also known as Mersane Warria, was smoking up to 20 cones of cannabis a day when she developed a severe form of schizophrenia in late 2014.

© AAP 2017

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