Poser, from what I understand (I'm no expert), doesn't use the same scaling conventions as other 3D programs, and this can lead to problems importing and exporting figures from and to other applications. Are you exporting as an .obj file from LW to Poser? There is a free utility called OBJaction Mover, in free stuff I think, which should help fix problems like this. Otherwise it looks like you're stuck with reducing your prop size by 50% in Poser and resaving it to the props library. Or I suppose you could blow Vicki up to 200% but I don't know whether any conformed figures or parented props would scale with her.

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire