The family of a First Nations woman left in a northern Perth backyard for seven hours is demanding a public apology from WA Police Commissioner Col Blanch.

Jamie Lee Garlett, 37, died suddenly at a relative's home in Kallaroo, Perth's northern suburbs, on May 26.

Family members say she began gasping for breath and convulsing around 4:15pm.

Her sister-in-law dialled triple zero and performed CPR until paramedics arrived roughly ten minutes later.

Despite efforts to revive her, Ms Garlett was pronounced dead at 5:06pm.

Her family said paramedics contacted police because the sudden death was reportable to the Coroner, but officers did not arrive at the home until 10:10pm.

Ms Garlett's body was finally removed around midnight, nearly seven hours after her death was confirmed.

Children and teenagers were among those left waiting at the property, her relatives said.

WA Police said officers had been told the death was not suspicious and attendance was prioritised alongside other urgent incidents.

Jamie Lee's cousin Tamara Lee Gartlett told National Indigenous Times family members met with several WA Police officers on Wednesday at the Daydawn Advocacy Centre, which supports Aboriginal people navigating legal and government systems. Advocate Betsy Buchanan also attended.

"They (WA police) handed us an apology letter from Commissioner Col Blanch, " Tamara explained.

In the letter seen by National Indigenous Times, Commissioner Blanch writes an extensive review into the police response to removing Jamie Lee Gartlett's body, "found that the delay became prolonged without sufficient escalation or intervention".

"The review identified a number of shortcomings in our organisational response," including insufficient supervision, missed opportunities to coordinate resources and inadequate recognition of the impact on the family," Commissioner Blanch wrote.

"Importantly, the review identified a number of shortcomings in our organisational response."

Commissioner Blanch reinforced his position by stating he accepted "that our service to your family that evening did not meet those standards".

"For that, I offer my sincere and unreserved apology," he said.

But for Tamara, the meeting and letter fall short after what she calls a dehumanising ordeal for her cousin, even in death.

She wants Commissioner Blanch to apologise publicly and show what changes WA Police will make to emergency responses, so no other family faces the same ordeal.

"We want him to do a public apology and to announce what changes they've made, so not just for us, just so the public are aware that those changes are in place," Tamara said.

Her push for public police accountability and systemic change remains unwavering.

"I'm not going to stop," she said. "I'll go until the end until we get actual change and for them to acknowledge publicly that they were in the wrong."

National Indigenous Times contacted WA police who said: "WA Police are engaging with the family directly."

"We have nothing further to provide at this time," they said.