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Momena Shoma attacked Roger Singaravelu with a kitchen knife while he was having an afternoon nap in his Mill Park home, in Melbourne's north, in February 2018.
The Victorian Supreme Court had heard she yelled "Allahu akbar" as she plunged the knife into Mr Singaravelu's neck with such force the blade tip broke off when it was dislodged.
His five-year-old daughter witnessed the attack and still suffers from fear, trauma and an inability to trust people.
Six days before the attack, Shoma had searched the internet looking for night-vision goggles so she could see in the dark, and later purchased them for $10, the court heard.
She became radicalised in 2013 and was joyous at the rise of the Islamic State caliphate in Syria and Iraq a year later.
On the morning of the attack she had downloaded a video from Islamic State's media centre, Al Hayat, entitled Flames of War.