LeFevre was active in civic work involving children and education. She was president of the Denver Orphan's Home, secretary of the
Wolcott School for Girls, benefactor of the Florence Crittendon Home for Girls and supporter of the Children's Hospital. She was the original founder of the
Charity Organization Society, one of the first charity movements in the country, on the first board of the St. Luke's Hospital and was an active member of the Ladies' Relief Society, an early Denver charity. She was on the board of directors of the
Young Women's Christian Association and the oldest member of the Community Chest, which later became the
United Way of America. LeFebvre was director of Art Association and a benefactor of the
Denver Art Museum. She was president of the Denver Branch of the
American Association of University Women and a member of a number of clubs, including the Denver Women's Club, the Women's Press Club, the Denver Country Club and the Monday Literary Club. ==Personal life==