The school teacher is being treated in hospital for injuries that are not life-threatening, while a search is under way for the woman.
When contacted by the Herald, the school declined to comment, referring all media enquiries to the Department of Education.
The department has been contacted for comment.
Parents of children at the school have begun to gather at the school gates. It is not believed there were many children, if any, at the school at the time of the stabbing.