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SERIAL killer Peter Tobin’s niece is a twisted troll who threatened to slash a 12-year-old girl.

Jade Jackson, 20, spent four months bombarding the girl with messages.

She said it would be “cool” when the child “had blood pouring from her” in a message sent with a chilling Snapchat image of her holding a blade.

Jackson, whose late dad was Tobin’s brother, contacted the Paisley youngster several times a day after accusing the girl of speaking to her boyfriend.

She is in custody at Cornton Vale prison near Stirling over her terrifying threats.

Tobin, 69, is serving three life sentences in Saughton jail for murdering three young women.

Paisley Sheriff Court heard Jackson was arrested at her home in the town last November after the child’s mum called police.

The girl had been living with taunts and threats since July.

Julie O’Hara, prosecuting, said Jackson contacted the girl on Facebook and said they should meet. O’Hara said: “The accused thereafter said she was going to ‘slash’ the complainer. She contacted the complainer on her mobile phone about five times a day stating ‘she had messed with the wrong person’."

(Image: PA)

The court heard Jackson threatened to go to the victim’s school and said the girl would be a “sorry lassie” if she ever spoke to her boyfriend again. The youngster tried to warn Jackson off by claiming her dad was a police officer.

She replied: “What’s he gonnae do? He will get smashed tae.”

The girl became concerned for her safety when Jackson sent her the knife picture and her mum then told police of the threats.

Jackson, who has been in custody since her arrest, last week admitted an offence under the Communications Act.

Michael McKeown, defending, said Jackson had a traumatic upbringing and struggled with behavioural problems and learning difficulties.

He claimed the victim’s mum had responded by calling Jackson a “gingey f***” and warned she would do “damage to her”.

He asked for bail until sentencing next month but Sheriff Tom McCartney told Jackson: “Given your previous record of convictions, bail is not appropriate.”

Jackson was living at home with mum Anne, 49, when she targeted the schoolgirl.

She is the youngest of four children Anne had with Tobin’s brother Robert. He died in 2008.

Tobin was jailed for the 2006 murder of student Angelika Kluk, 23. Her body was found hidden in the Glasgow church where the rapist was a handyman.

Police then found the remains of Vicky Hamilton, 15, and Dinah McNicol, 18, at Tobin’s former homes.

In 2010, Jade’s sister Charlene, 28, was segregated from one of her uncle’s victims in Cornton Vale prison after boasting about being related to the fiend.

Warders were reported to be ensuring that the woman – who fought off knife-wielding Tobin in his Paisley flat in 2005 – did not meet her.