An 18-year-old jail inmate died of a drugs overdose despite repeated warnings to prison authorities, her mother told an inquest on Monday.
Sarah Campbell died the day after being sent to HM Styal Prison
Sarah Campbell died in hospital after overdosing on the prescription drug at Styal prison, Cheshire, in 2003.
She died at Wythenshawe hospital, Manchester, the day after being convicted of manslaughter.
Her mother Pauline said Sarah, a self-harmer, had earlier tried to kill herself while on remand at Styal.
The court heard how Campbell went from being a promising art student and tennis champion in her youth to a heroin addict, who was eventually sentenced for the manslaughter of a pensioner on 16 May 2002.
Ex-serviceman Amrit Bhandari collapsed and died of a heart attack after Campbell and another woman tried to rob him in Chester city centre.
The inquest, at Warrington Town Hall, held a one minute silence, at Mrs Campbell's request, for her daughter, and five other prisoners who died within a year at Styal prison.
Retired lecturer Mrs Campbell, who broke down in tears, said she had made the prison aware numerous times her daughter was vulnerable and had been self-harming.
"My experience was that they would listen and say something would be done but I did not feel reassured or that anything would really be done," she said.
She said her daughter - who had not taken heroin for eight months before her death - had been prescribed the anti-depressant Seroxat, in 2000, after trying to harm herself.
Campbell was on the segregation unit at the jail when, on 18 January 2003 - three days before her 19th birthday - she told a nurse she had taken a "large quantity" of pills.
She was taken by ambulance to the hospital but died from a toxic level of the prescription drug in her blood despite doctors' attempts to save her.
The inquest, which is scheduled to last for two weeks, will hear from 39 witnesses.