Lair of the White Worm: Chapter IX
There are two statements in this chapter that could apply to Lady Sylvia in the film.
". . .had some strange power of making the wills of other persons subservient to their own."
and ". . .there being a mysterious link between the woman and the animal."
Of course, they do not. The first statement refers to Caswell in the book, who does not exist in the film. And the second statment refers to the mongoose in the book, and there is no proof of any link, mysterious or otherwise, between Lady Sylvia and the mongoose in the film.