Tania Maree Walker and her partner Daniel John Simmons, from Echuca, are each charged with child homicide in relation to the death of 23-month-old Angela on July 19, 2008.

Mr Simmons has also pleaded not guilty.

After a two-day hearing in the Bendigo Magistrates' Court, magistrate Marc Sargent committed the two accused to stand trial.

The court heard evidence from forensic pathologist Dr Michael Burke that chest injuries from blunt force were a cause of Angela's death.

In response to questioning from Crown prosecutor Kristie Churchill, Dr Burke said the combination of the fatal injuries with other injuries on Angela's body would suggest they were "non-accidental" injuries.

Dr Burke also told the court it was a complex case.

The court heard Angela had internal bleeding, with tears in her heart and the membrane surrounding her lungs.

Dr Burke said resuscitation efforts could have worsened these tears and some of the rib fractures observed in Angela likewise were caused in such a way.

The court was told Angela also had a fractured pelvis and injuries to her genitalia, head and face.

Dr Burke did not consider these contributed to her death.

In response to Ms Walker's defence lawyer Markorius Habib, Dr Burke said the pelvic injury could have occurred after Angela stopped showing signs of life, saying there was no evidence of inflammation, which was a sign of healing.

Dr Burke also agreed it was fair to say that the chest injuries, save for inflammation, could have been attributed to CPR.

But deputy director of the Victorian Paediatric Forensic Medicine Service Dr Joanna Tully said it was uncommon for children to be injured by CPR and such injuries were usually minor.

"My opinion is that while some of the injuries to Angela's chest could have been from CPR... I think that to attribute CPR as the cause of death, there is no support in the forensic paediatric literature," Dr Tully said.

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The court heard non-medically trained individuals could find it difficult to identify symptoms of internal bleeding.

The court heard Dr Tully wrote in her case review that had the accused appreciated the significance of Angela's symptoms the night before she died, her life could have been saved.

Dr Tully acknowledged that recognising the symptoms was key to this.

There was a high chance Angela would have survived, she said, had treatment been sought several hours earlier.

Dr Bala Kumar Pillai, who oversaw the resuscitation efforts in July 2008, said everyone performed their duties appropriately.

Dr Mahtab Ghadiri was an intern at Echuca Regional Hospital in July 2008, when Angela was brought in by Ms Walker.

Her notes from the time say that a dog had jumped and tried to bite Angela's face, causing her to fall onto her face.

Witness Timothy Cockburn gave evidence that he saw Mr Simmons and Angela in a car park the morning before Angela died.

He said Mr Simmons was agitated and asked him if he had seen a dog, telling him one jumped up or lunged at Angela and knocked her over.

"Agitated. Not crazy angry, but sort of worried... as if he was looking for something," Mr Cockburn said.

He said he saw Angela again that evening when he visited Mr Simmons and Ms Walker's home.

Mr Cockburn said Angela seemed reluctant to calm down and go to bed, and Ms Walker was holding her.

Another witness, Murray Haigh, also said he saw Angela the night before her death and "she wasn't her happy self, she didn't seem well".

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Dentist Dr Jeremy Graham gave evidence that one set of injuries on the toddler's face were likely the bite mark of a human child, based on their shape and size.

Nurse Melissa Andrews was working the night before Angela died and the court heard she took a call at 2.50am about a two-year-old.

She advised the man to call an ambulance or bring her to hospital if he was concerned.

Inspector Graham Guy, formerly of the Victoria Police Homicide Squad, was the lead investigator in 2008.

The court heard police intercepted three phone lines and installed listening devices in Ms Walker and Mr Simmons' house and two cars between August 2008 and September 2008.

Inspector Guy said police obtained "nothing of evidentiary value" in reviewing the recordings.

He said the material from the intercepts and listening devices did not contradict what the two accused had told police in their interviews and it "pretty much reiterated what they told us".

The court also heard from current informant, Detective Senior Constable Leigh Prados, that recordings of conversations between Ms Walker and an undercover officer in the cell following Ms Walker's arrest revealed nothing of value.

The matter will proceed to a directions hearing in the Supreme Court next month.

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