Heartbroken Alison Madgin, 43, spoke out moments after Jordon Jobson, 15, was convicted of murdering her daughter in a cowardly street attack.

Aspiring model Samantha Madgin, 18, had acted as a peacemaker to break up an argument between some of her friends and other people, including Jobson.

Jobson, who had drunk six cans of lager and three-quarters of a pint of vodka and snorted eight “lines” of cocaine, launched a ferocious attack as Samantha – who had given birth to her first child Callum just 10 weeks earlier – walked away.

Jobson lashed out with a knife and left her victim bleeding to death in an alleyway in Wallsend, Tyne and Wear, last August, with 13 knife wounds to her face, arms and chest.

Yesterday, a jury at Newcastle Crown Court convicted Jobson, of Walker, Newcastle, of murder. The court had rejected her admission of manslaughter. She will be sentenced on April 7.

After the verdict, Mrs Madgin said: “Society is plagued by serious teenage crime. Until politicians untie the hands of the police and the courts, it can only get worse.”