Canberra woman Gabrielle Woutersz, 26, has pleaded guilty to manslaughter with diminished responsibility over the 2014 killing of her mother Norma Cheryl Woutersz.
Woutersz faced trial for murder last year but after deliberating for three weeks the jury was unable to reach a verdict.
She was accused of killing her 56-year-old mother by repeatedly hitting her in the head with a hammer in their Dunlop home.
It was alleged she then tied her mother's body to a ladder and attempted to bury it in a backyard planting box.
Woutersz never denied killing her mother, but her lawyers argued she was not guilty by reason of mental impairment.
The prosecution argued she was criminally responsible because her psychotic state was drug-induced.
The trial in 2016 included graphic images from the scene of the killing, as well as evidence that Woutersz heard many voices, including Satan, Jehovah and deceased rapper Tupac.
A new trial was to begin at the end of this month, but that has now been abandoned.
During the original trial, prosecutor Shane Drumgold acknowledged the tragedy and emotion in the case where Woutersz went from a happy family upbringing, to drugs and prostitution.
"This addiction turned a previously loving and caring young girl into a drug-dependent and increasingly psychotic drug user," he said.
"Nobody wants to believe a young girl could fall so low — culminating in the tragic death of her mother."
Bernard Collaery, representing Woutersz, questioned the crown's account that the young woman's ice addiction had spiralled.
But he did admit it was "certainly a chaotic, crazed killing".
Woutersz is expected to be sentenced later in the year.
