She has the necessary qualification (NVQ level whatever in english and maths) and can apply for jobs in schools as of now, as a teaching and learning assistant and / or (if she prefers secondary) cover supervisor. If she then gets her feet under the table at a school, she could enquire about the GTP route whereby you get paid on the job at the host school. Word of caution - with GTP all is dependent on your teacher mentor, and some see GTP students as an opportunity to offload work onto a tame supply teacher.
An additional way in with secondary is to look for summer school, learning resource centre work, and even clerical work. Just to get yourself known in a school.