Convicted teen murderer Caroline Reed Robertson should get on with her life free from vigilantes and heckling, her victim's mother says.
Robertson walked from prison on Tuesday after being jailed for 20 years in 2000 for the murder of Rachel Barber, a girl she used to babysit.
Rachel's mother Elizabeth Barber says "the best thing for everybody" is Robertson going away somewhere quiet to adjust back into the community.
She says Robertson has a personality disorder.
"I think that would be the safest possibility for the community, if she is not harassed and if her family is not harassed," Ms Barber told Fairfax radio on Tuesday.
"Because, I don't think it would be good to push somebody with a personality disorder into a corner, where they can't see any way out.
"So the best possibility for everybody is for no vigilantes, nobody to go heckling her, and just let her get on with what she's got of her life."
Ms Barber said Robertson had shown "absolutely" no remorse for Rachel's murder, and she would have preferred to see her serve 17 or 18 years in prison.
"Nobody wants their daughter murdered, and justice, as far as Rachel is concerned, will never be done," she said.
"Because Rachel's life has been taken away from her."
A Corrections Victoria spokesman confirmed Robertson was released from the Dame Phyllis Frost Centre on Tuesday morning.
Robertson, who was 19 at the time of the killing, became eligible for parole in August 2013.
Rachel's body was found with black electric cable knotted around her neck in a shallow grave at a Kilmore property owned by Robertson's father in 1999.
At her trial, the court was told Robertson had a destructive obsession with her victim and wanted to "become" the younger girl.
The story was turned into a 2009 film, In Her Skin, starring Guy Pearce, Miranda Otto and Sam Neill.
