During the trial, pathologist Dr Thambirajah Balachandra, who performed Stewart's autopsy, said a vein in the 36-year-old's neck was severed when the knife cut through her face, deep enough to hit the right side of her throat.
He estimated the wound to be about 11cm deep. About 150ml of blood was found in Stewart's stomach as well as blood in her airways.
"[The stabbing was] due to alcohol, drugs or a combination of the two, or perhaps something more," defence counsel Marie Dyhrberg QC argued in her final address to the jury yesterday.
"[It was] not the violent outburst of someone that has lost it."
She has argued that her client showed no murderous intent and claims she acted unconsciously, suffering from an "automatism".
However, Justice Edwin Wylie told the jury to ignore the automatism claims.
Dyhrberg said Browne was also badly affected by a plethora of alcohol and drugs.
However, earlier in the trial Stewart's cousin, Patricia Stewart, told the court that Browne "had a look about her" as she walked into the room with her hands behind her back, clutching the knife.
There had been a "tussle" between Browne and Stewart before the stabbing, but witnesses did not anticipate the violence to escalate.
"Carly was angry. She said, 'Well, I don't care. I'm not scared of her'. Then she said, 'I'll be the bigger person and walk away'," Patricia Stewart said.
Just minutes later she saw Browne enter the lounge.
"Out of the corner of my eye I saw Anna come into the dining room. She had her hands behind her back.
"She had a look about her, I could sense something was about to happen."
She told the court Browne walked past her without flinching before plunging the knife into Stewart's face.
"She stabbed Carly, and then just walked back out, she was just staring at Carly.
"I could see her removing - the knife coming out - and I could even hear it."
Dyhrberg said Browne zoned in on Stewart and was in a "trance-like" state with no idea of her actions or the consequences.
Dyhrberg has also argued there were no harsh words, no hot rage, no vicious plunge of the knife, but just a quiet "whimpering" of Stewart's name by Browne.
"She was not unleashing words of murderous hate," she said, urging the jury to find her client guilty of manslaughter, not murder.
"No premeditation, no planning, but in the midst of a party, music, friends, good times," Dyhrberg said.
Party host Emmanuelle Sinclair described the occasion as a chance for the group to socialise and have a few drinks.
"[It was] supposed to be a good day - everyone was looking forward to it," she earlier told the court.
However, Browne became "aggressive, irritated" with other people at the party, she said.
Crown prosecutor Nick Webby has also said Browne became increasingly agitated.
He said witnesses saw Browne abusing other guests before Stewart came to restrain her.
Witnesses described how Stewart dominated, intimidated and made Browne scared, telling her, "you f*** disrespectful b***, my nieces are f*** here".
He said Browne's disproportionate response was to grab a knife and stab Stewart.
Webby described how, out of all the utensils in the kitchen, Browne chose the largest knife before approaching Stewart with it behind her back to maintain the element of surprise and then striking at her head.
"Can you really infer any other intention but an intention to kill?"
The knife was later found in the kitchen sink, however, how it got there remains a mystery after one of the women at the party said she saw Browne drop the knife.
"No one has admitted moving the knife, it's just one of those mysteries," Dyhrberg said.
Browne's state of mind has been the subject of much conjecture throughout the trial and ultimately what the jury will have to determine when reaching its verdict.
After the stabbing Browne left the party, wandering down the road, only to return and claim she had no memory what had just occurred.
"You do not go back to be at the mercy of the friends of the person you have just murdered," Dyhrberg said yesteday.
"You don't murder someone in front of witnesses. You don't return to the scene after being forcefully ordered to leave."
A delayed urine test by police, about eight and a half hours after the stabbing, and the lack of a blood test meant it may never be known what Browne was thinking, Dyhrberg added.
But Webby used medical experts to argue that Browne suffered anti-social and attention deficit disorders.
He said the defence team's medical expert had said during the trial that the attention deficit disorder combined with alcohol consumption had a direct relationship to Browne's violence and emotional responses.
These responses were "often out of all proportion to the triggering event", he said.
