maybe you have a look at the Walkthrough and go to all the torch locations one-by-one again
to find the missing
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She spawns after you solve the snake/rat puzzle
(move to the right side after her bed to the next room)
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v27041 to v36061 Walkthrough with all keys:
https://f95zone.to/threads/treasure-of-nadia-v36061-nlt-media.38582/page-73#post-2660772
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https://f95zone.to/threads/treasure-of-nadia-v36061-nlt-media.38582/page-183#post-2896935
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Main Page of this Thread with all FAQs and Saves too