A woman jailed for attacking 7-Eleven customers with an axe will spend a further five years behind bars.

Sydney transgender woman Evie Amati, 26, was sentenced to nine years in jail in January after being found guilty of two counts of wounding with intent to murder and one count of attempted wounding with intent to murder.

Amati filed an affidavit in the Supreme Court requesting not to extend her sentence after the Crown demanded a harsher punishment.

But following the appeal court's decision on Monday, Amati will now spend 14 years in jail with a non-parole period of eight years.

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Sydney woman Evie Amati, 26, was in January sentenced to nine years jail after being found guilty of two counts of wounding with intent to murder and one count of attempted wounding with intent to murder

'I beg for the court's mercy to not impose more time upon someone genuinely trying to make amends with the victims, the community at large, together with ensuring my own rehabilitation,' she said in the affidavit, the Sydney Morning Herald reported.

'I am doing everything possible to honour the suffering of my victims and their families … [to] resolve the problems that led to my horrific assaults.

'I have taken to stabilising myself and eliminating my reliance on cannabis and other narcotics, which was another factor in my offending. My complete abstinence ... has been crucial to my making imprisonment a constructive experience.'

In July, the NSW Court of Criminal Appeal was told a nine-year maximum jail term was an affront to justice.

Amati attacked two strangers with an axe inside the 7-Eleven at Enmore and then chased down a nearby pedestrian in January 2017.

Amati will spend a further five years behind bars after her sentence was appealed

Axe attack victim Sharon Hacker leaves the Supreme Court building on Monday, as Amati has sentence substantially increased

The first victim, Ben Rimmer, suffered a fractured nasal bone, eye socket and cheekbones and bled profusely onto the petrol station shop's floor.

Sharon Hacker, struck in the back of the neck, had the potentially-fatal blow softened by thick dreadlocks, while pedestrian Shane Redwood blocked the axe with his backpack.

'(Nine years) was not an appropriate sentence for the offence against Mr Rimmer, let alone all three of them,' crown barrister Maria Cinque said.

'Nine years with a minimum of four-and-a-half years is so manifestly inadequate that it is an affront to the administration of justice.'

Victim Ben Rimmer, who suffered a fractured nasal bone among other injuries, is seen leaving court on Monday

Before the late-night attack, Amati had been on a Tinder date, felt she'd been identified as transgender and took a cocktail of alcohol and other drugs.

Amati was allegedly attacked inside Mary Wade Women's Correctional Centre last week after inmates demanded that she be moved to a men's prison.

Amati, a transgender woman, said she has made appointment with a endocrinologist to begin the 'de-transitioning' process.