Natalie Ford plunged a knife into her partner's chest so hard it chipped his ribs and left the skin bruised from the force of the blow, a court has heard.
Ford has pleaded not guilty to murdering Gary Marshall at Orewa last year. She has admitted stabbing him but says it was self-defence after she was punched, kicked and choked.
Crown prosecutor Mark Davies continued cross-examining Ford in the High Court at Auckland yesterday.
He quoted expert evidence from forensic pathologist Dr Michael Arnall, who had told the court it was difficult to see any injuries on Ford.
"Certainly your injuries were nothing compared to the knife wound you delivered to Gary Marshall," Mr Davies told Ford, who had said she had feared for her life as Mr Marshall put his hand around her throat.