How does Mistress Hibbins eventually die in "The Scarlet Letter"?

Mistress Hibbins is considered evil in the Puritans' society. She is bitter and unpleasant.  She openly tells Hester that Hester wears her symbol of sin on her chest while the minister hides his sin.  She is contantly going into the woods at night (the woods being considered the "Devil's Playground" and therefore an evil place to hang out). Because of her strange behavior and the opinion of the public, she is eventually tried and executed as a witch.