[4] She developed a devotion to international modernism and by 1920 "her style had evolved from the loose colourful brushwork of Impressionism to the more hard-edge geometric fragmentation of natural form".
She was influenced by the writings of Jay Hambidge and his theory of dynamic symmetry, which was instrumental in the development of her Passion Series.
[7] Munn sought to convey spiritual truths within a formal order "like her colleague and admirer Lawren Harris".
[5] Frederick Housser wrote that Munn was "probably the only painter in Canada whose canvases show an interest in cubism",[8] which did not suit the popular styles of painting in Toronto at the time she was practicing and exhibiting.
He also said "More attention might be paid to her if she exhibited in New York or Paris, instead of Canada, where public appreciation of this kind of painting is as yet undeveloped ..."[8] Munn died on in Toronto, Ontario at 87 years of age.