Possible Clues:

• Blessed Mother of Calcutta
• O'Faolàin's saint? Or would-be saint?
• 1950s singer Brewer
• Mother of Kolkata
• Mother who appeared on two covers of Time
• Nun who won a Nobel Peace Prize
• Peace Nobelist right after Anwar and Menachem
• Mother --, nee Agnes Bojaxhiu
• Nun of Ávila
• 'Music! Music! Music!' singer Brewer