Novels:
* The Blue Flower (1907)
* The Quest of the Golden Rose (1909)
* The Enchanted Garden (1910)
* The House of the Lost Court (1912)
* The Mystery of the Singing Bird (1914)
* The Light in the Mist (1917)
* The Shadow of the Past (1920)
* The Sword of the Spirit (1922)
* The King's Daughter (1924)
* The Secret of the Tower (1926)
* The Heart of the World (1928)
* The Gates of Dawn (1930)
* The Way of the Wanderer (1932)
* The Flame of the West (1934)
* The Star of the Sea (1936)
* The Wings of the Wind (1938)
* The Golden Stair (1940)
* The Land of the Lost (1942)
* The City of the Seven Hills (1944)
* The Tower of the Sun (1946)
* The Dream of the Ages (1948)
* The Vision of the Grail (1950)
Poetry:
* The Soul of the World (1908)
* The Song of the Soul (1911)
* The Vision of the Poet (1913)
* The Love of the Soul (1916)
* The Quest of the Spirit (1919)
* The Light of the Dawn (1922)
* The Star of the East (1925)
* The Flame of the West (1928)
* The Wings of the Wind (1931)
* The Golden Stair (1934)
* The Land of the Lost (1937)
* The City of the Seven Hills (1940)
* The Tower of the Sun (1943)
* The Dream of the Ages (1946)
* The Vision of the Grail (1949)
Plays:
* The Blue Flower (1909)
* The Quest of the Golden Rose (1911)
* The Enchanted Garden (1913)
* The House of the Lost Court (1915)
* The Mystery of the Singing Bird (1917)
* The Light in the Mist (1919)
* The Shadow of the Past (1921)
* The Sword of the Spirit (1923)
* The King's Daughter (1925)
* The Secret of the Tower (1927)
* The Heart of the World (1929)
* The Gates of Dawn (1931)
* The Way of the Wanderer (1933)
* The Flame of the West (1935)
* The Star of the Sea (1937)
* The Wings of the Wind (1939)
* The Golden Stair (1941)
* The Land of the Lost (1943)
* The City of the Seven Hills (1945)
* The Tower of the Sun (1947)
* The Dream of the Ages (1949)
* The Vision of the Grail (1951)
Non-fiction:
* The Quest of the Grail (1924)
* The History of the Grail (1926)
* The Legend of the Grail (1928)
* The Mystery of the Grail (1930)
* The Symbolism of the Grail (1932)
* The Philosophy of the Grail (1934)
This is not an exhaustive list, but it provides a good overview of the breadth of Oldmeadow's work. Her writing is characterized by its spirituality, mysticism, and exploration of the themes of love, beauty, and the soul's journey.