The attack was carried out at the family’s house in Beringen, near Schaffhausen, local reports said.
The 21-year-old attacker fled the scene, but later turned herself in at a local police station where she was arrested.
Her 51-year-old mother, who was seriously injured in the attack, was treated by paramedics on site before being airlifted to the hospital, reports said.
A knife that was allegedly used in the attack was seized at the apartment, reports said.
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