Saw the new post today on this older thread and it piqued my interest because one of the questions I hope to eventually answer is whether or not the VM might have been written by a woman. I'm at the very beginning of my hobbyist research into the origin and history of the VM but one of my current leanings is that it was written by a Late Medieval or Early Renaissance polymath or alchemist or apothecary.
One possible female alchemist worth noting, if not considering as a possible VM source, is Catarina Sforza, 1463-1509, whose Gli Expermenti contained 454 recipes, mostly medicinal, some cosmetic and some alchemical. She bequeathed this manuscript to her son, Giovanni dalle Bande Nere, who allowed Lucantonio Cuppano, in 1525, to copy the recipes from the manuscript. This transcription was purchased by Pier Desiderio Pasolini in 1887, who in turn had it transcribed and 102 copies published in 3 volumes. Cuppano's transcription contained encrypted passages for which he also provided a key, though it is not known whether Catarina or Cuppano authored the encryption.
Nick Pelling, who has been quoted in threads on this site, wrote a paper in 2003 proposing a connection between Catarina Sforza and the VM: You are not allowed to view links.
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Login to view.. Another interesting paper, though it just covers the Gli Experimenti, not in connection with the VM, is Anna Palmieri's 2016/2017 You are not allowed to view links.
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Login to view., written while she was studying at the University of Bologna. Possibly also of interest, Meredith K. Ray, an Associate Professor of Italian at the University of Delaware and author of Daughters of Alchemy: Women and Scientific Culture in Early Modern Italy (2015), gave a lecture on Catarina Sforza's alchemy experiments at New York University in 2015 (click You are not allowed to view links.
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Login to view. for an article that includes a YouTube of the lecture).
While my current leanings are the VM was written by a Germanic person, probably male, and closer to the carbon dating range 1404-1438, I believe the very existence of Catarina and the Gli Experimenti point to the possibility of a female author.
Hope this is helpful, or at least interesting.