She was born in Saint-Vincent-de-Paul (now Laval, Quebec) and began taking piano lessons with Arthur Letondal [fr] at the age of 7.
In 1917, she won the Prix d'Europe and, in 1920, she received a scholarship from the Ladies' Morning Musical Club.
Malépart studied five years at the Conservatoire de Paris with Isidor Philipp, Maurice Amour and Roland Broche.
After her return to Montreal, she toured throughout Canada and the United States and performed on radio.
Her students included Lise Boucher, Andrée Desautels, Pierre Hétu, Claude Lagacé, Mireille Lagacé [fr], François Morel, Renée Morisset, Claude Savard, William Stevens, Gilles Tremblay and Ronald Turini.