The killer of Bolton schoolgirl Emily Jones has had her minimum sentence increased.
Eltiona Skana, 30, was sentenced to life imprisonment for slitting the seven-year-old's throat in Queen's Park, Bolton, last year.
She was told she could not be considered for parole for at least eight years.
However, the minimum period has now been upped to 10 years and eight months after the judge who passed sentence said it had been "calculated in error".
Mr Justice Wall explained in a brief hearing at Teesside Crown Court, where he is currently sitting, that he had arrived at the original figure by halving the notional determinate sentence of 16 years.
He said: "However, when I passed that sentence I had forgotten from the 1st April 2020 the law as to the minimum period to be served by a violent or sexual offender whose sentence was or exceeded seven years was two thirds and not one half of the sentence.
"It is an error to which all in court fell, for which I take full responsibility."
Skana, who has been diagnosed with paranoid schizophrenia, attended the hearing via video-link from high-security Rampton Hospital where she is a patient under the Mental Health Act.
The judge had previously ruled that despite her mental illness Skana retained "a significant amount of responsibility", which merited punishment by him passing not a hospital order but a "hybrid" order, meaning the defendant will go to prison for the remainder of her sentence if her condition improves sufficiently.
Emily had been riding her scooter to meet her mother when Skana leapt from a bench, grabbed her and stabbed her on March 22 of last year.
In a victim impact statement read in court today Emily's dad Mark Jones described his daughter as a 'kind child' who was 'bright and funny'.
He added: "Emily was a vulnerable child full of innocence and wonder, she was just starting off on her path of life and her future was cut short.
"Our future has also been taken away. How can we enjoy life when the best part of it has been taken away?"
Skana, an Albanian national, who first came to the UK in 2014 after claiming asylum, had a long history of mental illness and had not been taking her anti-psychotic medication.
She admitted manslaughter on the grounds of diminished responsibility.
