I think I read it in Rabbi Antelman’s essay re-Sabbateans.

Check out this review as well, which has way more details. Particularly, this part:

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Maciejko brings the same objectivity to bear on a host of other highly charged subjects, from Frank’s anti-establishment religious teachings, to his weird sexual behavior, to his adoration of the Virgin Mary and identification of his own daughter as her reincarnation. These and other aspects of Frank’s life and teachings are placed by Maciejko in the broad context of 18th-century Eastern and Central Europe, a region that witnessed the emergence of a whole array not only of rogues and charlatans but of syncretistic spiritual movements from Alchemists and Rosicrucians to Freemasons. Among Maciejko’s most original contributions is his comparison of Frank with the scandal-ridden adventurer Giacomo Casanova, who appears to have maintained extensive connections with Frank’s daughter Eve and several of her disciples.
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As an addendum… http://www.sphinxradio.com/collinsfrank.mp3