A young mother jailed for nine years after her baby daughter died from passive heroin smoking had her sentence cut by a third yesterday when a judge said the original term was too severe. Lorraly Ng Lok-wan, now 21, was jailed in June after she admitted manslaughter through gross negligence. Her case was the first recorded - legally and medically - where a victim had died from the passive smoking of morphine, a heroin derivative. Ling-li was only 10 weeks old when Ng cradled her on her lap in a public toilet and 'chased the dragon' - smoked heroin - six times, for a total of about 15 hours over a 27-hour period. The baby had six times the amount of morphine needed to kill her in her blood when she was brought to Queen Mary Hospital on February 16 last year. Yesterday, Ng's counsel, Munira Moosdeen, said Mr Justice Thomas Gall had adopted too high a starting point for sentencing and had failed to adequately assess her background and psychiatric reports. The judge had said Ng's background was 'of little help'. Ms Moosdeen painted a picture of an abandoned teenager who turned to hard drugs in Secondary Two to fight off loneliness after being dumped by her parents. 'She was an unmarried mother, 19 years old at the time of the offence,' she said. Mr Justice Frank Stock said in the Court of Appeal yesterday that the case was a difficult one to sentence because it was unprecedented and manslaughter cases often covered a wide sphere. He said those who neglected their duty of care and endangered lives because of their drug addiction should be treated harshly. While there was no sign she had beaten her child, she was aware of the dangers when she exposed Ling-li to heroin, he said. Mr Justice Stock said it was necessary to look at previous cases, not to adopt their starting points but to examine the process used to arrive at the decision. 'We do, however, think the sentence was too severe in all the circumstances,' he said. He substituted Ng's nine-year sentence with a six-year term. But he said that as Ng had been jailed for three years for committing two burglaries while on bail for manslaughter, one year from that term would run consecutively with the manslaughter term, leaving her with a seven-year sentence. Ms Moosdeen told the court Ng took heroin throughout her pregnancy because of her 'stupid and ignorant' belief that the foetus would suffer more if she quit and suffered withdrawal symptoms. After Ling-li was born, she spent her first 20 days in hospital. She was released into Ng's care, who then left her with her [Ng's] godfather and only visited twice in five weeks. She visited on February 15 and her godfather gave her $1,700 to take Ling-li to the doctor, as she was ill. Ng bought heroin instead. Mr Justice Michael Stuart-Moore and Mr Justice Gareth Lugar-Mawson also presided.