The 19-year-old, who cannot be named because he was a minor at the time of the alleged offence, will face court in Sydney for arraignment on September 7.

Magistrate Albert Sbrizzi committed the teen to stand trial after a two-day hearing in Parramatta Children's Court which heard from several people, including one witness who told the court Louise had been left cold and alone, lying on a cement floor, in her final moments.

Yesterday, a teen told the court Tracey Taylor, who has also been charged with accessory to murder, paid him $80 to dig a hole to bury a "dead dog" in the backyard of murder accused Patricia Goddard's Bellambi home.

The teen, who also cannot be named, told the court how he spent a day digging up to two metres deep, through soil and clay, with the 19-year-old co-accused at Taylor's request.

The witness claimed he was provided with a shovel and a pickaxe and told to dig the hole deep enough to fit a red wheelie bin.

Goddard was charged with the murder of 18-year-old Louise O'Brien after the teen's badly decomposed remains were discovered on February 28 last year wrapped in a plastic sheet, sealed inside a 240-litre bin buried in Goddard's yard.

Goddard's daughter, Taylor, 46, was charged with being an accessory to the murder.

On Monday, Crown prosecutor Nick Borosh told the court "evidence suggests Louise's life with the Taylor family wasn't a happy one", noting that she was subjected to "extended punishments of an extremely violent nature" while living with the family at their Woonona home.

The prosecution alleges Louise died on or about October 12, 2008, after Goddard struck her in a fit of anger, either throwing a hammer at her or hitting her in the jaw with it.

The blow allegedly resulted in a subdural haemorrhage, which eventually caused Louise to collapse.

An autopsy later revealed Louise had fractured shoulder blades and a fractured jaw with a round depression, consistent with a hammer. She also had a number of rib fractures which had started to heal.

In a recorded police interview, played for the court on Monday, a witness told a detective about the constant physical abuse Louise had endured at the Taylor home, including how she was burnt with boiling water, had a cup smashed over her head and was hit with sticks or poles if she complained.

The witness also claimed Goddard shaved the girl's head, shoved food in her mouth and forced her to eat her own scabs.