Wran was high on ice as she listened to Daniel McNulty being killed in the Redfern unit in which she was standing.

She had thought the two men she was with would rob Mr McNulty, not kill him.

Mr McNulty was murdered by Wran's boyfriend of two weeks, Michael Lee, and another man, Lloyd Haines, during a botched ice deal at a public housing unit in Walker Street on August 10, 2014.

And although she tried to call triple zero, Wran ultimately decided to keep silent over what happened inside unit B30.

For keeping her silence and being part of a robbery, Wran was sentenced in the NSW Supreme Court to a minimum of two years and a maximum of four years.

She cried and put both hands over her face after Justice Ian Harrison read out her sentence.

Justice Harrison handed down a minimum of two years and a maximum of four years for robbery in company, and a one-year term for acting as an accessory after the fact.

Wran, 28, the daughter of the late NSW premier Neville Wran, will be eligible for parole on August 13.

Justice Harrison had told the court the offences carried maximum jail terms of 25 years and 20 years each.

However, he said the accessory to murder and robbery in company offences were both at the lower end of objective seriousness.

"Ms Wran also demonstrated powerful evidence of genuine remorse, taking personal responsibility for her conduct," he said.

He said Wran had no previous criminal convictions, has been a model prisoner and has been drug free since entering jail.

"Drugs and drug addiction do not discriminate among different sections of the community," he said.

Justice Harrison said Wran's early guilty pleas entitled her to a 20 per cent discount for the robbery charge and a 25 per cent discount for the accessory charge.

He noted that, at the time of the offences, Wran was suffering from a number of illnesses including bulimia and bipolar disorder in addition to her drug addiction.

Justice Harrison emphasised that Wran played no role in the events that unfolded inside the unit once she had knocked on the door.

"Once entry to the unit had been gained, the robbery escalated well beyond the scope of the offence to which Ms Wran was a party.

"Indeed, it escalated unexpectedly and quickly in a manner that she did not anticipate or foresee," he said.

He described Wran's accessory offence as "harbouring Mr Lee for a period of three days and failing to bring him to the attention of police".

"One view of Ms Wran's criminal conduct in this case, the offence unfolded while she was significantly affected by drugs or the desire to use them and became or remained Mr Lee's disinterested companion during three days of somewhat pathetically unremarkable inactivity."

Wran was originally charged with the murder of Mr McNulty but the charges were downgraded by the Crown on July 6.

Wran then pleaded guilty to the lesser charge of accessory after the fact to murder - knowing that Lee had murdered Mr McNulty - and robbery in company.

This month, Wran spoke for three hours at her sentencing hearing, explaining to the court how she went from private school girl who abused Ritalin to an ice junkie who ended up in the middle of a bloody murder.

"I'm ashamed to have been involved in anything like that. I can't believe someone died," she told the court.

"It just sounded like someone was trying to breathe but they couldn't and they were trying to scream as well," Wran said.

"I regret every step I took that night."

Lee pleaded guilty to murder on June 16 while Haines pleaded guilty on June 21.

"I never thought in a million years I'd end up in jail, let alone for murder. I've never intended for anyone to get hurt in my life," she said.

"If I hadn't knocked on the door perhaps it wouldn't have happened."

Outside court Jill Wran told reporters she was "thrilled" her daughter would be coming home soon.

"I really just want to thank all the people who've been on this journey with us, and especially our legal team, who have been so genuinely with Harriet at every twist and turn - and especially other mothers, all of them," she said.