Born Faye Yeager in Pascagoula, Miss., she was a graduate of the Convent of Mercy in Mobile, Ala. She earned a degree in accounting from Spring Hill College, also in Mobile. She studied at Tulane University and the Catholic University of America.
Sister Monica entered the Sisters of Mercy in 1955 and professed her final vows in 1961.
Becoming a certified public accountant in 1960, she was controller of what was then Mercy Hospital in downtown Baltimore from 1959 to 1962, treasurer of Mount St. Agnes College in Mount Washington from 1962 to 1971 and Loyola College's controller from 1971 to 1991.
She then became an administrator at St. Peter the Apostle Roman Catholic Church at Hollins and Poppleton streets in Southwest Baltimore.
"She was a particularly gifted student. She astounded her professors by her acumen," said the Rev. Michael Roach, former pastor of St. Peter Church who is now pastor of St. Bartholomew Church in Manchester in Carroll County. "Of an artistic bent, she would go every Saturday morning to the Cross Street Market to purchase flowers wholesale and then transform them into gorgeous arrangements for the high altar. She was never too high and mighty to perform any task, no matter how menial."
A Mass of the Resurrection was offered yesterday.
Sister Monica is survived by a cousin, Vivian Brooks Whit of Warren, Ark.