Explain the significance of the needle in the "poppet."

Cheever discovers the poppet that Mary Warren made for Elizabeth, and he finds a needle inside the doll. Cheever tells Proctor and Hale that Abigail has charged Elizabeth with attempted murder. Cheever says that Abigail was stabbed with a needle while eating at Parris' house, and Abigail accused Elizabeth's spirit of stabbing her