Watched this a fair while back with Mary as part of a Czech film night double bill with Pictures of the Old World.
Pretty ridiculous. The tone is madcap from the beginning but it does retain a Picnic At Hanging Rock vibe until the vampires and the coffins come out for real. Weir definitely a touchstone with the education of young girls and the unlocked occult potential. Can hear all the Broadcast-isms in the soundtrack too which is great in itself.
VahWoW gleefully trashes its own internal logic, which is funny if a little frustrating. Pretty unsettlingly sexualised presentation of the 13-year old lead at points, too. Still, over all lavish and rollicking, and definitely a perfect b movie counterpoint to PotOW.