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« on: Wednesday 01 May 24 10:03 BST (UK) »
There is indeed a Teachers Registration Council document for a Kathleen Mary Carrick. Registration date is 1st August 1926. Address Rutherford College Girls School, Newcastle On Tyne.
In the Experience section is Assistant Science Mistress, date 1920.
If I have the right one she died in 1990 in Sunderland.
So as Andrew has suggested a teacher not a fellow pupil.
Death record gives a date of birth of 21 April 1899. She is on the 1939 living in Yorkshire, occupation is Teacher and single.