Her new job (or old job, now she is back in the 1940's) is assisting the billeting officer. Although billeting officers are usually male, there were a few exceptions, but Mrs June is not one, she assists the male officer.
One of the main tasks of the department is allocating evacuees. Although children are mostly recognised here, there were hundreds of thousands of women with young children as well as over ten thousand pregnant women, and some folk with disabilities. This kept them out of areas likely to be bombed.
Mrs June does not like children, or in fact, most people very much, but has reluctantly taken on the job in wartime. She gets a fairly cushy office and doesn't have to work on the searchlights in the cold and rain, or dig in the fields with the land army.