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LONDON — A 16-year-old Danish teen who stabbed her mother to death after watching ISIS beheading videos has been jailed for nine years, local media reported.

Lisa Borch, then 15, killed Tina Römer Holtegaard with the help of her 29-year-old Islamist boyfriend in October, 2014, Danish website The Local reported.

Borch was alleged to have stabbed her mother at least 20 times as she slept in her home in Kvissel, a small village in the country’s north.

The court was told that Borch and her Iraqi boyfriend, Bakhtiar Mohammed Abdullah, had watched beheading videos on the night of the murder and had agreed to kill Holtegaard together. However, they blamed each other for the murder during the trial, The Local reported.

Abdullah was sentenced to 13 years’ prison for his role in the killing.

Danish media reported the teen's step-father as saying she was infatuated with ISIS, and that he feared she would become more radicalized in prison.

Borch and Abdullah have reportedly appealed to Denmark’s high court over the ruling.