Her Eternal Crown
From Bahaipedia

Her Eternal Crown is not a retelling of the life of Queen Marie; rather, it is the story - told largely in extracts from her own letters and diaries and from those of Martha Root - of the deepening relationship between a European monarch and the religion whose teachings she championed for the rest of her life.
Della L. Marcus, of American lineage, brought up in Luxembourg and the Holy Land and now living in Romania, draws on previously unpublished materials found in the Romanian State Archives and the archives of Bahá’í institutions to provide a unique glimpse into the life of Queen Marie.
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978-0-85398-442-5