A 22-year-old woman has admitted to stabbing her boyfriend after a five-day bender on the drug "ice", Murwillumbah Local Court was told yesterday.

Shannon Leah Herman, 22, of Mooball, pleaded guilty to maliciously wounding her boyfriend in October last year in the Sydney suburb of Randwick.

Police told the court that Herman admitted to the stabbing as her boyfriend was being taken by ambulance to hospital where he later underwent surgery for the back wound.

"We were on goey for five days. Speed, ice, whatever it is it really changes the way you are and think," Herman said.

"I stabbed him. I don't know why. I don't remember doing it. I felt really angry ? I remember that.

"We've been coming off drugs and drink and he has been pushing me mentally and emotionally abusing me. I stabbed him."

Counsel for Herman told the court yesterday that prior to the stabbing the boyfriend had grabbed Herman around the throat.

The court was also told that Herman had been subjected to a history of domestic violence.

Herman admitted she had gone too far in protecting herself, took full responsibility for her actions and had recently completed a drug rehabilitation program.

Magistrate Jeff Linden said the circumstances surrounding the incident were disconcerting and the couple had been enmeshed in a drug scene.

Mr Linden said Herman had shocked herself knowing she could have killed her boyfriend and in that event she would have been jailed.

Herman needed ongoing treatment to deal with some serious issues, he said.

She was convicted and placed on a two-year good behaviour bond with supervision and ordered to comply with the apprehended violence order already in place.

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