Answer:
Mrs. White is disgusted by the appearance of the monkey's paw.
Step-by-step explanation:
This is the most likely explanation for the way Mrs. White reacted to the monkey's paw. In the story, we learn that she is curious about the paw after hearing the story. However, we also learn that the monkey's paw is mummified. We can imagine that the sight of it is not a pleasant one. Mrs. White was most likely disgusted, despite her interest, when she saw the paw. This is supported by the fact that she "drew back with a grimace."