During the Spanish Inquisition, Jewish women who secretly maintained their faith emerged as unprecedented religious leaders, performing roles traditionally reserved for male rabbis. These "Marrano" women led prayers, conducted marriages, and created distinctive rituals, particularly around the Fast of Esther, as they struggled to preserve Jewish tradition without access to formal religious institutions. Historical analysis of Marrano practices and liturgical texts reveals how these communities deeply identified with Queen Esther's biblical narrative of hidden identity, using the Apocrypha of Esther as their central spiritual text. Through examination of oral histories and religious customs, the research documents how persecution paradoxically opened new pathways for female religious authority and ritual innovation. A dramatic piece, "The Secret Jew," further illuminates these concealed female experiences through performance, bringing voice to long-silenced traditions. The recovery of these women's religious practices proves essential for understanding both Jewish historical experience and the evolution of female leadership in Jewish life. This investigation bridges Jewish feminist scholarship with studies of religious resistance during the Inquisition, demonstrating how women's forced separation from traditional Jewish knowledge sparked creative adaptations that continue to resonate in contemporary Jewish practice.