After a long campaign by Yamatji-Wajarri woman Dorothy Papertalk, Western Australia's Attorney General has called for an inquest into the deaths of her three grandchildren in 2022.

Jamelia Hawke (10), Arnda (seven) and Kelvin (four months) were killed in Port Hedland by their mother the day after she was turned away from a women's refuge.

Ms Papertalk has long fought for an inquest to examine why her multiple warnings to authorities did not lead to the removal of the children for their safety.

She had asked repeatedly to become the permanent carer for the children but was dismissed in the years and months before their deaths.

Margaret Hawke is serving life in prison for the murders.

WA Attorney General Tony Buti had said he was unable to order an inquest into the killings without new evidence, even releasing private legal advice on the matter.

Former WA Governor Malcolm McCusker KC and former president of the WA Children's Court Denis Reynolds wrote to the AG twice arguing his office had the discretion to order an inquest regardless.

On Thursday Dr Buti said he had reviewed files related to the children's death, which he described as "heartbreaking", the ABC reports.

"I'm now satisfied there is new evidence and circumstances that were not considered by the former coroner Philip Urquhart in his decision not to conduct an inquest," the Attorney General said.

He added he had written to the current coroner requesting an inquest.

"This tragedy is unspeakable and my thoughts have and always will be with the family members who are grieving," Dr Buti said.

Federal minister for Indigenous Australians Malarndirri McCarthy had also called on the WA Government to ensure an inquest into the deaths was carried out.

The Attorney General also announced a broader review into the laws guiding coronial inquests, saying they needed to be "as easy to navigate as possible".

The review is expected to be completed by the end of next month, and the legislation is expected to be introduced into parliament in 2027.