Ciavazzaro previously provided fotoromanzo images of unidentified credited actress Noelle Dumas (this is her only known credited film role), but it looks like no final decision was reached on which unidentified actress she was. (
viewtopic.php?f=56&t=475&hilit=noelle+d ... 030#p50918)
Mauro favoured the priestess in 45 / 46 / 54, while Johan's vote went to the handmaiden in 7 / 8 / 26.
I think I'm inclined to go with Mauro, the priestess seems to resemble the fotoromanzo actress and I think it would be far more likely that the priestess would be a credited role rather than one of many handmaidens (even if she is seen slightly more prominently than the others). Any other opinions to help us decide would be welcomed.