Katherine Hulme and Marie Louise Habets
Found a link for Kathryn Hulme's collected papers. There is a photo of Audrey Hepburn with Marie Louise Habets, whose life was the inspiration for The Nun's Story.
http://beinecke.library.yale.edu/collections/highlights/kathryn-hulme-papers
MLH would have been about 53 in this photo (born in 1905).