Over the course of her career, Douglas conducted research for what would become the Burney Centre and McGill University, was an author of technical manuals for IMAX Corporation, and ran a Toronto-based consulting business.
[1][2] A career change landed her at McGill University, where she worked as a lecturer in English (1947–1959) and as a researcher on a project related to what would become the Burney Centre.
[1] As an employee at IMAX, she was an early adopter of AutoCAD to facilitate the use of diagrams, and subsequent updates, as part of her technical work.
[1] One of her projects consisted of working for the Girl Guides of Canada to establish the arrangement structure for their archives, as well as developing a catalogue and digital finding aids.
I’ve Inherited an Attic Full of History", Douglas' guide for non-archivists, Candice Vetter called the work "useful and easy to follow" containing "advice essential for the layperson".