I had the chance to obtain the book some time ago. Was very, very difficult to locate, and as amelia commented the undertone of the book was a very sad one. Marina was elderly when she wrote it, yet many of events she described mirrored the thoughts of a young girl. There was a sense of regret, remorse and lingering grief over the events which undoubtedly molded her fate.
I'm suspicious over the accuracy of the article, but many of the things it mentioned do add up. After the scandal and death of Nicholas Youssoupoff, Marina was outcast by society. She spent some time in a sanitarium recovering from the shattered emotional state she was left after the death of Nicholas. After this she traveled all over Europe not returning to Russia until five years later when her mother passed. Considering her reputation was tarnished, it's likely Marina did engage in some affairs believing she had nothing else left to lose. I've read she had a minor romance with Grand Duke Dmitri. She eventually married, but in her book she hardly mentions her husband or son, if I recall correctly.