Returning to the University of Toronto she was awarded her B.A. degree in Mathematics in 1945. Cecilia Krieger, who taught Cathleen mathematics while she was an undergraduate, had been a family friend for many years.
Nagbabalik sa University of Toronto siya ay iginawad kanyang BA degree in Mathematics in 1945. Cecilia Krieger, na nagtuturo Cathleen matematika habang siya ay isang undergraduate, nagkaroon na ng isang pamilya kaibigan para sa maraming taon.