After reading all of Irene Nemirovsky's books that I could get in English, I really wanted to know more about her - and then came across Jonathan's Weiss' biography.
My feeling is that the book would have been made a lot stronger by withholding the judgment of whether Irene knew herself to be Jewish / French / Slavic, and whether she was "Jewish enough", i.e., whether some of her writings bore an antisemitic undertone --- I would let the reader decide that. Her works speak for themselves, and the reader will have the final word.
I strongly feel that Nemirovsky's *vision* was not at its strongest when its object was too close to her heart / her surroundings - which is what happened in "Wine of Solitude". I find her writing to be much stronger, her observations more precise, the pictures better painted and the language more beautiful in books dealing with French subjects ("Suite Francaise" unsurpassed of course, "Fire in the Blood", "All Our Worldly Goods", and "The Fires of Autumn", and "Dimanche" - a short story, but wonderful nevertheless). France was truly the country of her heart, and all the more painful it must have been for her to realize in summer of 1942 that she became a persona non grata, a stranger in the place she considered her home for many years, if not most of her life.