I think this is a worthy sequel to the Cushing "She".
Olga Schoberová hasn't much to say but did not need to be dubbed as she can at least string a sentence together. (Unlike Ursula.)
The story follows up where She left off but that is not obvious until half way through the film. If you are looking for a modern day formulae (obligatory love scene with 20 seconds of bare breasts, three way love triangle with lovers screaming at each other, etc. etc,) you will not find it. Just a good story with a host of good actors no all became famous.
The opening sequence has a terrific theme tune and has Olga wandering down a lonely road. We never find out who she is or where she comes from or how she manages to be immaculately dressed despite being lost and weary but this is the 1960s.
The mythology of an eternal flame that grants everlasting life at a cost is central to these films as is the deceit and betrayals that go with people's lust for what they cannot have.
Sit back and enjoy the ride.