Robert Massie gave a fairly good overview of the Schanzkowski family in "The Romanovs: The Final Chapter" and he's definitely an author who never believed in Anna Anderson.
Here's the relevant excerpt, from page 249 of the hardcover edition:
"Who was Franziska Schanzkowska, the woman who for over sixty years had claimed to be Grand Duchess Anastasia? She was born in 1896 in the Prussian province of Posen, adjacent to the border with Poland, which was then a part of the Russian Empire. Two hundreds years before, her family had belonged to lesser Polish nobility, but by the end of the nineteenth century, the family were farmworkers. Franziska's father, an impoverished alcoholic, died when his children were young. In the village where she grew up, Franziska always was different and solitary. She did not make friends, and she tried especially to distance herself from her sisters by assuming what they considered an affected, upper-class manner. At harvesttime, when the entire village was out in the fields bringing in hay, Franziska would be found lying in a cart reading books on history.
" 'My Auntie Franziska was the cleverest of the four children,' " said Waltraud Schanzkowska, a resident of Hamburg. " 'She didn't want to be be buried in a little one-horse town. She wanted to come out into the world, to become an actress -- something special.' " In 1914, shortly before the outbreak of the First World War, Franziska, at age eighteen, left the Polish provinces for Berlin. She worked as a waitress, met a young man, and became engaged. Before she could marry, her fiance was called up for military service. Franziska began working in a munitions factory. In 1916, the young man was killed on the western front. Soon afterward, Franziska let a grenade slip from her hands on the assembly line. It exploded nearby, inflicting splinter wounds on her head and other parts of her body and eviscerating a foreman, who died before her eyes. She was sent to a sanitarium, where her physical injuries healed but the shock remained. Franziska was declared "not cured, but not dangerous," and discharged. She was taken in, almost as a charity case, by Frau Wingender, who gave her a room of her own, Incapable of working long periods, Franziska was in and out of sanatoria; in between, she remained bedridden at the Wingender's apartment, complaining of headaches, swallowing pills, and reading history books from the local library. In February 1920, her favorite brother, Felix, received a last message from her. On February 17, 1920, she disappeared."
