It can reasonably be inferred from the passage that Abigail is able to charge murder upon Elizabeth Proctor due to the fact that: Elizabeth stuck the needle in the poppet Mary Warren gave her as a gift.
Abigail witnessed Mary Warren sticking the needle into the poppet during court and used it as evidence against Elizabeth.
Reverend Parris has conspired with her to rid Salem of the Proctors.
Abigail knows Reverend Hale will testify on her behalf to the lack of Christian character of Elizabeth.