how is the doll used against Elizabeth in act 2?

Mary Warren gives Elizabeth a poppet (doll) as a gift,

Mary Warren: "I made a gift for you today, Goody Proctor. I had to sit long hours in a chair, and passed the time with sewing. "

Elizabeth, perplexed: "Why, thank you, it’s a fair poppet. "

Later, it's discovered there is a long needle in the poppet. Abigail pretends that Elizabeth is using it as kind of a "voodoo doll " to cast spells on her.

It is used to accuse Elizabeth Procter Of bewitching Abigail