Mother Mary Susan elected President of the Congregation (now Monastic Congregation) of St. Scholastica.
One of the principal efforts of her first two years in office was obtaining permission for the use of English in the Divine Office. Sisters throughout the congregation had overwhelmingly requested this change. In 1964, permission was received. On the Feast of Corpus Christi in 1964, the Sisters recited First Vespers of the feast in English for the first time.