God's Mighty Servant (2012)

The story of Sister Pascalina Lehnert, who was the personal confidant and secretary to Pope Pius XII for forty years, when he was the papal nuncio in Germany, and then for his whole pontificate. The Pope had great confidence in her wisdom, energy, and loyalty, and she became known as "the most powerful woman in the history of the Vatican."

Unfortunately the movie God's Mighty Servant is not yet available on HBO Max.