A SPURNED mistress who threw acid over her ex-lover's wife and his four-year-old daughter in a horrendous attack which left them both scarred for life was yesterday jailed for 13 years. Victim Cheung Choi-mei, 39, who nearly died after the acid melted her face, was left disfigured and confined to a wheelchair. Doctors had to amputate Mrs Cheung's leg after it went gangrenous when they removed tissue for extensive skin grafts to her face, the High Court heard. Mrs Cheung's daughter, Shuk-yi, was also left with ''serious scarring'' after acid splashed on her neck. Passing sentence, Deputy Judge Jones told Lee Chen Mao-zhen, 33, her revenge attack was ''shocking to a degree which words are inadequate to express''. ''The injuries to the mother can only be described as appalling, requiring major surgery and leaving severe permanent damage.'' The judge sentenced Lee to 11 years each on both counts of throwing acid with intent to disfigure. The terms will run mostly concurrent to give a total of 13 years. But outside court, Mrs Cheung, who said she had considered suicide many times since the attack, claimed the sentence was too lenient. She said: ''No matter what the sentence, even death, it will not compensate for my injuries and loss. ''She will be released. I have to live with these awful injuries for the rest of my life. ''She is a devil woman. She seduced my husband. What she did was really wicked.'' Lee, a devout Catholic, planned her evil revenge after she was dumped by Mrs Cheung's husband, Cheung Sai-shing, 40, following a brief affair. The attack happened after mother-of-two Lee invited herself over to the couple's Tsing Yi home on December 16, 1992, on the pretext of celebrating the birth of their baby son. But minutes after arriving, Lee threw highly corrosive toilet cleaner over mother-of-four Mrs Cheung. As her victim ran to the door screaming in pain, Lee tried to drench her again, but this time caught four-year-old Shuk-yi. Forensic examination showed the fluid contained hydrochloric acid and sulphuric acid - the latter at a very high concentration. Following Lee's conviction earlier this month, the judge requested psychiatric reports. But a doctor at Siu Lam Psychiatric Centre said Lee, who had a history of ''violent and dangerous'' behaviour towards her husband, was not mentally ill. He also doubted the sincerity of her remorse. But character witness Father Paul Vallat of the Young Christian Workers Centre told the court Lee had been ''very remorseful'' and had fainted on learning Mrs Cheung had to have her leg amputated. He said Lee, who tried to commit suicide five months after the attack, was a ''simple, shy person'' who was lonely and trapped in an unhappy marriage. But Deputy Judge Jones said: ''I'm unconvinced of the defendant's remorse. Remorse, anyway, in an offence of this nature may be of help to the defendant herself but can matter little to the victim.'' He said the suicide attempt could equally be a sign of self pity. During the trial, prosecutor Philip Cantrill told the court how Lee had a brief relationship with Mr Cheung after going to work part-time at his pharmacy in July 1992. When he ended the affair in October, Lee begged him to take her back, but Mr Cheung refused, the court heard.