Mildred was born in Hubbard, Saskatchewan, Canada one of six children and the younger of two daughters of Stewart Wilson and Eva Janette Hubley Shankel. Her oldest brother, George, would become known for his work in education in South Africa and the U.S. and the musical accomplishments of his daughter, Virginia-Gene Shankel Rittenhouse.

Mildred married Erwin Baulder Lange, an immigrant from Germany, in October 1946, shortly after they had accepted positions at KC, he as dean of men and she as piano teacher. She later guided one of her piano students, Wendolin Pazitka (later Munroe), in completion of grade ten requirements in Canada's Toronto Conservatory of Music program before Wendolin graduated from the high school program at KC. Pazitka returned to teach voice and direct the choir at KC in 1974, before accepting a position three years later at Canadian University College, where she has served with distinction since then.

Mildred was living in Courtice, Ontario, Canada, when she died at age 95.

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