Here's an article with some more details about how she came to invent assembly language. This is a "necessity is the mother of invention" tale that I always find fascinating starting with "Andrew Booth, whom Kathleen would eventually marry, had previously done X-ray crystallography research at the University of Birmingham and that included doing a lot of computations. This started him down the path of building computing machines to make the work easier.":

https://hackaday.com/2018/08/21/kathleen-booth-assembling-ea...