I am a big fan of her and her story in itself, so I have just ordered this book. Really excited about it, I love photography books and this one will be a nice addition to my collection: 

‘Vivian Maier Developed,’ an Intimate Biography of a Very Private Photographer – The New York Times:

A new biography, by Ann Marks, a former corporate executive with a background in analyzing “everyday people,” rejects this idea of exploitation. The book seeks to gently restore credit to those who put the photographer on the map — principally John Maloof, a real estate agent-turned-artist whose film “Finding Vivian Maier” was nominated for an Oscar. (Maloof seems to have emerged the intellectual-property victor from a nightmarish thicket of international copyright issues and competing advocates.) Marks believes Maier would have been pleased to be on that map, despite a life of obscurity that at times veered into squalor.