Two drug dealers who fed a four-year-old girl heroin, methadone and ketamine for up to six months before she died have been jailed for 13 years each.
Michala Pyke, 38, fed her daughter Poppy Widdison the drugs as she was an "inconvenience" to her relationship with 40-year-old John Rytting, Hull Crown Court was told.
"You drugged that child for your own squalid reasons," the judge told Pyke.
The judge described Pyke as "utterly unfit" to be a mother and a liar whose expressions of love towards Poppy during the trial were "a despicable masquerade".
Poppy died in June 2013 after suffering a cardiac arrest in Rytting's "squalid" home in Grimsby.
Speaking outside court, Poppy's uncle, James Widdison, said he did not think the family or social services could have foreseen what happened.
We've waited three and a half years for this day and it doesn't get any easier.
Poppy's grandparents Judi Widdison and Fred Soar were in court for the sentencing.
Mr Soar said: "She was a lovely girl - joyful to have round."