I have the book on my Kindle, and a friend of mine told me that it was an interesting read; but I haven't read it yet as I'm reading two large books already. The book 'My Story: Wartime Princess' is about Princess Margaret's life during the war (it's not written by her, by the way
) and in the book Margaret (Rhodes) is described as 'their very close friend.' So yes, I agree with you about the fact that Margaret Rhodes is a life long friend.
"She is a little angel and like her name, she brings sunshine even on cloudy days. From the bottom of our hearts, we would like to thank each and every one of you for your lovely best wishes for our daughter. She feels very loved". HRH Princess Madeleine, Duchess of Hälsingland and Gästrikland on her daughter, HRH Princess Leonore, Duchess of Gotland.