I have a copy of a book in the Dutch language, the contents of which seem to be a translation of "Darite Lyubov" (
https://www.ozon.ru/context/detail/id/6245449/). Its third chapter is entitled "Garden of the Heart" (Сад сердца). This chapter is basically a collection of thoughts, quotes, poems, short excerpts from temporary sources that the Empress copied into a notebook in 1917, whereas the other chapters on marriage and family life contain material from earlier years. As the publisher wrote: "If it is to reveal to the reader the truth about her pure soul, it is sure to become not as much a historical discovery as a religious one."
Based on your posts on this forum, I think you may find "Garden of the Heart" an interesting and valuable book. However, I'd recommend "Darite Lyubov", including the other chapters.