Cleaner guilty of 92yo's bashing murder

Papanicolaou's lawyers had argued she was substantially impaired by an abnormality of the mind when she carried out the attack.

But the jury on Wednesday rejected that claim - a partial defence that allows a lesser conviction of manslaughter - instead returning a verdict of guilty after deliberating for half a day.

A trial in the NSW Supreme Court has heard Papanicolaou jumped a back fence and allegedly hit Ms Welsh with her walking sticks so forcefully they broke, and smashed heavy ceramics down upon the defenceless woman.

The elderly woman was also stabbed in the lower chest and abdomen.

She died six weeks later in hospital.

Papanicolaou had told the trial she had "blacked out" during the attack, and had been suffering from depression at the time.

"I see Marj ... the sound of the (medical alarm) machine makes me open my eyes and get up, I don't know what I'm doing, just looking in front of Marj in front of the fridge with a lot of blood," the 38-year-old said while giving evidence.

"The blood is in my hands, I was holding the knife."

Earlier that morning the regular gambler lost $430 from poker machines in under an hour and was left with just $11 in her bank account, the jury has been told.

The Crown argued that Papanicolaou wanted to rob Ms Welsh after learning she had come into $8 million from the sale of a property.

It questioned her credibility, pointing out she had admitted lying to police in an interview, and contending she had given detectives significant details she could only know if she had full memory of the event.

It also argued Papanicolaou did not exhibit the mannerisms of someone who was depressed, and had never disclosed her feelings to anyone before the attack.

However, Papanicolaou's barrister Tom Quilter had rubbished the prosecutor's theft theory, saying there is "simply no evidence" Papanicolaou actually stole anything despite the jury hearing evidence that cash, a handbag, a ring and an expensive watch were inside the house.

Papanicolaou had never been violent before, he said, and had no motive to attack Ms Welsh, he said.

Papanicolaou will be sentenced at a later date.