Possible Clues:

• 'The Way of Perfection' writer
• Spanish patron
• First woman to be named Doctor of the Church, briefly
• Rubens painted her
• Bernini subject
• 16th-century Spanish mystic
• 16th century Span. Carmelite reformer
• Nun from Ávila
• 'Relaciones Espirituales' writer
• Joan Osborne hit