She was invited to exhibit with the [[Group of Seven (artists)|Group of Seven]] and through it became friends with [[A. Y. Jackson]] with whom she would go on sketching excursions along the [[Saint Lawrence River]]. She did a number of landscapes, with a particular attachment for Quebec's [[Eastern Townships]].
She joined the executive committee of "The Atelier: A School of Drawing Painting Sculpture" in 1931.<ref name=":0">{{cite book|url=https://www.aci-iac.ca/art-books/prudence-heward|title=Prudence Heward: Life & Work|last1=Skelly|first1=Julia|publisher=Art Canada Institute|year=2015|isbn=9781487100698|language=en|access-date=11 March 2017}}</ref> During the Second World War she designed war posters.<ref name=":0" /> In 1933, Prudence Heward co-foundedwas a charter member of the [[Canadian Group of Painters]],<ref>{{cite book|last1=Walters|first1=Evelyn|title=The women of Beaver Hall Canadian modernist painters|date=2005|publisher=Dundurn Press|location=Toronto [Ont.]|isbn=1282810855|page=18}}</ref> but her struggle with [[asthma]] and other health problems eventually slowed her down.<ref>{{Cite thesis|url=http://spectrum.library.concordia.ca/976414/|title=Challenging the status quo: Prudence Heward's portrayals of Canadian women from the 1920s to the 1940s|last=Powell|first=Grace|publisher=Concordia University|year=2008|location=Montreal|pages=105|type=masters}}</ref> A 1939 automobile accident curtailed her abilities further but she still produced some outstanding portraits until 1945 when her health had deteriorated to the point where she had to give up painting. She died two years later, while seeking medical treatment in [[Los Angeles]], [[California]].<ref name="Ferrari" />
