When Evie Amati entered a 7-Eleven in Sydney's inner west holding an axe and listening to her favourite metal song, people assumed she had left a costume party.

It was just after 2am on January 7, 2017 and she had held the axe by her side as she walked 450 metres from her Enmore home to the nearby convenience store.

Evie Amati did not deny her body carried out the attack, but said her mind did not.

Minutes earlier, she had updated her Facebook status to read, "Humans are only able to destroy, to hate, so that is what I shall do".

As well as the two-kilogram axe, she carried a bright yellow 18-centimetre kitchen knife in the back pocket of her shorts.