What evidence of Elizabeth's guilt does Cheever find?

Spectral evidence was permitted during the Salem Witch Trials in 1692. Toward the end of Act Two, Marry Warren does admit that she pushed the needle into the poppet herself and that Abigail saw her do it in court that day. Elizabeth, realizing how Abigail has framed her becomes angry. Cheever takes this statement as further evidence that Elizabeth wants Abigail dead.