The 34-year-old earlier made Google searches about murder, including "Killing someone with axe what part of body to go for".
At the time she was subject to an AVO after her partner told police she stabbed him with a meat cleaver, while he had three convictions involving violence against her.
The woman, who cannot be named as it would identify her children, faced a sentence hearing in the NSW Supreme Court on Friday.
She has pleaded guilty to murdering her long-term partner as he was lying down looking at his iPad in a Sydney townhouse in September 2020.
According to the agreed facts, he was with a woman when his partner rang and messaged him.
He told the woman it was his ex-partner, describing her as dangerous being both violent and abusive.
"She hit me with a big machete, she is f***ing wild," he said.
She sent 19 text messages to the effect of suggesting he was having sex with someone and tried to call him from around 5.30am to 1pm.
Earlier that month, she conducted searches on her phone for information including "Can you kill someone with hot boiling water" and "Is it really easy to murder somebody with a knife".
Before the murder, she did more searches including "What is the fastest part of body to kill someone with the axe".
In the early evening, she called a cab to take her to Bunnings, asked the driver to wait, and went inside and bought Trojan Brand half axe.
She later sent texts including: "You guys might hear something on the news I might be in prison I can't deal with it any more".
She went to the police station, confessing to the murder but told a string of lies including that her partner had produced a knife.
He was found to have died from multiple chop wounds to his head.
In a victim impact statement read to the court on Friday, his aunt described the family's pain at losing the humble and gentle man whom people loved being around.
She asked why he was taken away from them in such a horrific, brutal and cowardly way.
His relationship with his mother had been very supportive and they were like "peas in a pod".
But she died earlier this year, her heart being suffocated by trauma and grief over the loss of her beloved son.
In sentencing submissions, prosecutor Gabrielle Steedman described the ferocity of the axe attack noting the woman said she used all her might.
She also noted the planning and premeditation.
Defence barrister Bernadette O'Reilly described the couple's relationship as volatile and marred by domestic violence.
He had been convicted of violence offences against her in 2010, 2011 and in March 2019, while her client had no prior convictions.
Although she was said to have hit him with a meat cleaver, resulting in a 2-3cm graze, no charges were laid and police instead sought the AVO.
Justice Natalie Adams will sentence her on November 4.
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