The daughter of Charles-Eugène Lavallée and Marie-Anne Lemieux, she was born Madeleine LavalléeinMontreal and was educated at the Collège Viauville de Montréal and the Collège Jésus-Marie de Saint-Barthélémy. From 1947 to 1950, she worked in the office of the newspaper La PresseinMontreal. Bleau founded the parent teacher association for the Bois-des-Filion school board and served as its president from 1967 to 1970. From 1974 to 1977, she served on the municipal council for Bois-des-Filion. She was secretary for the No committee in the 1980 Quebec referendum. From 1981 to 1985, she was president of the executive for the Liberal Party in Groulx.[1]
She was elected to the Quebec assembly in 1985, defeating Parti Québécois incumbent Élie Fallu,[2] and was reelected in 1989; she did not run for reelection in 1994. From 1989 to 1994, she served as deputy government whip.[1]
After retiring from politics, she served as president of the financing campaign and then as a member of the administrative council for the foundation supporting the Centre hospitalier de soins de longue durée (CHSLD) Drapeau Deschambault in Sainte-Thérèse.[1]
