Ms Hopkin was then also stabbed multiple times and lost hold of the teenager.
The girl was then approached by two other teachers, Mr Stephen Hagget and Mr Darrel Campbell, who were seen trying to calm her.
Mr Hughes said she again threatened to kill Ms Elias if she saw her.
The court was told the teenager then moved to another area of the school and shouted at a pupil she was going to kill her, before attacking her.
At that point the teenager was restrained by teachers and taken to a classroom where she was later arrested.
The court also heard that a kitchen knife had been found in the teenager’s bag earlier in the year, resulting in her bag subsequently being regularly checked by her father.
However, on the day of the attack those checks weren’t done and she allegedly took a knife from her dad’s fishing kit which was kept in their living room.
