Jennifer Lee Jones, 44, pleaded guilty in the Supreme Court in Burnie to charges of wounding and assault for the May 2020 attack.

Crown prosecutor Katie Edwards told the court Jones and the victim had been in a relationship for many years and last year she told him her father was a part of the Jewish mafia and there was a plot to remove her limbs and harvest her blood.

Ms Edwards said Jones had also begun to suspect her partner of being involved with the mafia she feared, as he had begun to construct a "silencer" device in the shed.

About 3.30am on May 20, 2020, the victim was getting ready for work when Jones demanded to know if he believed her fears were real, which he did not.

The court heard Jones convinced the man to return to the bedroom to discuss the issue further and then "struck him to the head with a hammer".

Ms Edwards said Jones struck him a second time and that his head started to bleed freely from both hits, and a brawl ensued.

He attempted to flee to the kitchen where Jones cut his neck with a knife, and as he attempted to wrestle the weapon from her they both fell through a glass-topped table.

The court was told the man was then able to escape the house, and Jones called the police and said the man had attacked her first.

Defence lawyer Julia Ker and Ms Edwards both spoke during submissions about Jones' mental health.

Ms Ker said her client had been treated with antipsychotic medication.

She submitted that her moral culpability was reduced based on her psychological state.

Ms Edwards said there were concerns about Jones' welfare and community safety when she is eventually released from prison.

Acting Justice Shane Marshall ordered a forensic mental health report and remanded Jones in custody for sentencing on April 12.