In the months before she was killed by her boyfriend, Sean Lee King, the Sydney teenager had several talks with her mother and brother in which she agreed King was treating her badly.
But she was in love and too scared to go to the police, King's Supreme Court murder trial has heard.
Ms Ajbschitz's brother, David Larter, told the court he had "probably a few too many" conversations with his 18-year-old sister about King's behaviour.
He had allegedly assaulted Ms Ajbschitz on a number of occasions before her death in July 2011, including once in his home while family members looked on and did nothing.
"I told her she could do a lot better than someone who treated her like that," Mr Larter said on Thursday.
"Most of those conversations ended up with her agreeing."
But Ms Ajbschitz also told her brother she loved King, he told the court.
King, 26, has pleaded guilty to the manslaughter of Ms Ajbschitz at her Ultimo apartment in inner Sydney on July 10, 2011.
He has denied a murder charge on the grounds that he was high on drugs and did not intend to kill her or cause her grievous bodily harm.
The crown alleges King intended to kill and had threatened her with death in phone calls overheard by her friends.
He murdered Ms Ajbschitz by beating, kicking and stomping on her, it's alleged.
Her body was discovered by Mr Larter three days after the attack, when her mother, who was in Perth, became increasingly worried.
Anne Larter told the court she had noticed a bruise the size of an orange on her daughter's arm in January 2011.
When she met King during a lunch at Darling Harbour that same month, she had told him, "Don't ever hit my daughter again."
She told the court she had several conversations with Ms Ajbschitz about King.
"(I told her) you're a smart, bright, intelligent young woman and that she could do so much with her life," Ms Larter said.
Both mother and brother said they urged Ms Ajbschitz to go to the police, but Mr Larter said he believed his sister was "intimidated" by King.
The last time Ms Larter spoke to her daughter, Ms Ajbschitz told her she was scared King would break into her apartment.
"I told her it was a totally secure building and he couldn't get in unless she let him in," Ms Larter said.
The court was told that some time after that conversation, Ms Ajbschitz, who had smoked marijuana with her friends earlier that evening, allowed King into the apartment.
"When she didn't answer my last phone call, I thought she had gone to sleep," Ms Larter said.
Mr Larter became emotional as he recalled finding his sister's body, with blood on the walls and on the kitchen bench.
King hung his head in the dock as Mr Larter left the court in tears.
The trial continues before Justice Geoffrey Bellew.
