Jamie Lee Dolheguy begged for intervention less than an hour before inviting a man into her bedroom where she strangled him to death and whispered in his ear: "It will be OK."
Ms Dolheguy, 24, killed Indian-born student Maulin Rathod, 20, on July 23 last year at her Sunbury apartment after the pair met on dating site Plenty of Fish.
She then called police, telling them she killed someone and "it feels good".
The Victorian Supreme Court heard on Monday that Ms Dolheguy searched online shortly before Mr Rathod arrived the phrases "I will kill someone tonight" and "I want to commit murder".
She landed on a web page that offered advice and "10 steps to committing a murder and getting away with it".
But during day two of Ms Dolheguy's murder trial, the court heard the 24-year-old ward of the state — who has a history of borderline personality disorder – called and texted social workers asking them to intervene.
"I feel really sick with bad temptations," she texted one of her carers on the afternoon of Mr Rathod's death. "I want to call police but they won't believe me. I want to cry."
The court heard Ms Dolheguy received the following response: "Trust your judgment."
Earlier in the day she told her case workers she had forgotten to collect her medication and was panicking.
"It's urgent, I've forgotten my medication," she texted a carer from Jesuit Social Services. I didn't pick it up. OMFG (Oh my f***ing God)."
The carer advised her to "just ride to the pharmacy".
It is not disputed that Ms Dolheguy killed Mr Rathod, however lawyers are arguing whether she planned to kill him.
Her online dating profile declared she had extreme bondage fetishes. In six text messages between the pair, Mr Rathod told her: "We'll do whatever you want."
But as he was driving to her home, 39km northwest of the Melbourne CBD, Ms Dolheguy was searching the internet. She typed into Google: "I'm going to kill someone tonight for fun."
Ms Dolheguy, wearing pigtails, a grey cardigan and a dress, drew pictures in court while details of her alleged crime were read out. She picked from a number of coloured pencils and rarely looked up from the dock.
One of her drawings featured a red sun and a man coloured entirely in red.
Two of Ms Dolheguy's carers today entered the witness box to give evidence about her mental state in the lead-up to Mr Rathod's death.
Jurors, including eight women and five men, today heard Ms Dolheguy had attempted suicide a number of times and once needed to be rescued with bolt cutters. Her arms display cuts from years of self-harming.
The carer from Jesuit Social Services said Ms Dolheguy had spoken about harming others, but only in the context of her carers.
"She had specifically had discussions about harming staff members," the carer said.
"I can recall some discussions about staff members in particular that she didn't like and wished to harm."
The trial continues before Justice Peter Almond.