What is the main conflict in Christmas Not Just Once a Year by Heinrich Boll?

Christmas Not Just Once a Year tells the simple story of Aunt Milla's hysterical reaction to the taking down of the family Christmas tree in 1946 and her family's subsequent reaction to her hysteria. Told through the eyes of one of the family's first cousins, the story describes the complete moral and psychological disintegration of a family that refuses to acknowledge Milla's profound psychological problems. Instead of addressing the issue of Milla's breakdown clinically or directly, the family decides to continue with the ruse that every day is Christmas. For two years they go to great lengths and expense to host a nightly ritual of Christmas tree decorations and carol singing in order to keep Aunt Milla from screaming hysterically.