She had earlier screamed: "I'm going to f***ing kill you" after being asked by the deputy head what she had in her pocket.
Swansea Crown Court was played CCTV footage of the girl attacking the teachers at Ysgol Dyffryn Aman, in Ammanford, Carmarthenshire, then moving on to stab another girl before she was disarmed by staff.
The girl, who cannot be named, admits attacking three people but denies attempting to murder them.
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