A Tuen Mun mother who asphyxiated two of her children in a failed suicide attempt had her jail term reduced yesterday from seven years to four years. The Court of Appeal ruled the sentence handed down to Lee Fung-yee after her conviction of two counts of manslaughter last December was 'manifestly excessive', after hearing arguments by the defence that the trial judge failed to appreciate the mother's weakened mental state during the crime. Her son, Siu-hang, 13, and daughter, Po-ka, 12, succumbed to carbon monoxide poisoning after Lee drugged them and lit charcoal in her flat in attempt to kill herself, as well as the children. At trial, her lawyers argued Lee was distraught after learning about families kept on the side by her long-time boyfriend - and the children's father - Li Kam-sze. Lee was acquitted of murder, but found guilty of manslaughter by reason of 'diminished responsibility' and later sentenced by Madam Justice Clare-Marie Beeson. Lee's lawyers argued yesterday before Mr Justice Wally Yeung Chun-kuen and Mr Justice Ian McWalters that the sentence was excessive and did not take fully into account the 38-year-old woman's mental state or the power Li held over her during their long relationship. 'She was under the domination of [Li],' argued Charlotte Draycott SC for Lee. 'You can't say that a 20-year-old woman chose to have sex with the man.' Draycott pointed out Lee was found to suffer from anxiety, depression and stress. She noted that a doctor who saw Lee within a month of the killing diagnosed her with adjustment disorder and argued the trial judged ignored that fact. 'She was very mentally disturbed,' Draycott said. 'She was seeking to end her life. This is not a normal thing to do. This woman had intent to kill herself. She was afraid to leave her children alone.' The attorney said Lee would be 'no danger to anybody' if let out. 'She will never repeat it,' Draycott said. Although appeal court reduced the sentence, the judges did not provide details about their reason. Those will be handed down later. In all, Lee had three children by Li, including a surviving child who lived in another flat in the same building with the father and his live-in girlfriend. Lee turned away firemen who responded to smoke billowing from her flat during crime, claiming she was burning incense.