There was an article on the Royalty Digest site dealing with various 'hodge-podge' clippings. This one pertained to MP:
Let us start with Marie, Grand Duchess of Russia's book A Princess In Exile, a bestseller both here and in the States around 1932. In a cutting from the Evening Standard of March 11th, 1932 we find Marie flying 3,000 miles to be with her son Prince Lennart when he married Miss Karin Nisavandt. Neither Marie nor her brother Grand Duke Dimitri, who was also in London, attended the registry office wedding or heard Lennart renounce his royal rank. "Romanoffs," she told the press, "do not recognise register office weddings." Neither she nor her brother attended the Dorchester reception either, on the grounds that they hadn't been invited. Before the happy couple left for Lake Constance as Mr. and Mrs. Bernadotte, Marie sat in her Piccadilly hotel hoping they would call, but they didn't. It will be remembered that the Grand Duchess had a short and rather stormy marriage to Prince Wilhelm of Sweden in her younger days, hence the Bernadotte. The couple did receive telegrams from both Marie and King Gustav of Sweden, Lennart's grandfather. Marie talked to the press at some length. Her basic objection was the lack of a religious service, but there seems to have been little contact with her son and she was unaware that he was leaving that afternoon, instead of the following day. A friend explained some of the background. After the Russian Revolution, the Swedish Court had returned Marie's jewels but held onto her large dowry, upon which Lennart was living rather well while his mother worked as a dressmaker in New York. Her two books, both very popular, gave her back her independence. An ink note at the end of one chapter quotes Axel Munthe saying how intensely annoyed the Queen of Sweden was when Marie's reminiscences were serialised in a popular Swedish weekly magazine. She summoned Munthe and tried to get him to stop it. Another note quotes Rebecca West, in a review in the Sunday Telegraph of June 13th, 1974, as saying that Munthe was the lover of the Queen of Sweden. She certainly appears discreetly in the book The Story of Axel Munthe visiting him in the Mediterranean.
Another cutting in the same volume, from the Daily Mail of January 3rd, 1952, reports a luncheon in Sweden with Prince Wilhelm, his "life friend Mme. Jeanne de Tramcourt" and Prince Lennart (who seems to have dropped the 'Mr. Bernadotte' at this stage). Afterwards 67-year-old Prince Wilhelm was involved in an accident in a snowstorm in which the lady was killed. There is another note on an endpaper stating that both Marie and Dimitri were buried in a vault at Mainau in Germany belonging to her son 'Count' Bernadotte. Yet another cutting records her death in Switzerland in 1958 and that she had been estranged from Lennart for twenty years.