Throughout her career, Sandri made significant contributions to Catholic theology, particularly in the areas of ecumenism and interfaith dialogue. Her work on the nature of the Church, the sacraments, and the role of Mary in Catholic devotion helped to shape the theological landscape of the 20th century. Sandri's commitment to ecumenism was ahead of its time, as she sought to foster greater understanding and cooperation between Catholic and non-Catholic Christians.

Like many brilliant designers who prioritize craft over commerce, Maria Giovanna Sandri struggled with the corporatization of fashion in the late 1990s. When luxury conglomerates began acquiring smaller houses, they sought explosive logos and rapid turnover. Sandri’s slow, thoughtful, research-based approach fell out of favor.

(2020): An investigation into the ancient definitions of linguistic errors.

: She has conducted extensive research on the works of ancient grammarians like Herodian and Trypho .