Is the VMS a work of female authors ?

[LisaFaginDavis]

The answer to the original poster's question is yes, of course it could have been written by women. We know there were plenty of literate women in the Middle Ages, especially as late as the fifteenth century. We know women could be healers. They could practice astrology. They were artists. They were scribes. There is absolutely no reason to assume the manuscript must have been written by men. And there is definitely no reason to assume it was written by someone whose name is known. Hundreds of millions of people were alive in the fifteenth century. Only a very tiny percentage have known names. 

Colophon samples are useful, but they are a very selective sample and difficult to extrapolate. The vast majority of manuscripts produced during the Middle Ages do not have a recorded scribe name.