Christina was appointed as Headteacher of Nascot Wood Junior School in April 2013. Before this, she worked as a Special Educational Needs Adviser for Hertfordshire Local Authority. She was also the Hertfordshire lead adviser for children with Down Syndrome. She had a national position on the Down Syndrome Association (DSA) educational consortium, regularly contributing to publications and national conferences. She served on an all-party parliamentary committee, advising the government on mainstream provision for children with complex learning needs. She wrote the Hertfordshire secondary transfer guidance for children with complex needs, which was adopted as national guidance by the DSA.