I've read the book the Crucible in Act 4
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Once Tituba makes the confession that she has worked for the devil, her role in the play is essentially finished. Sarah Good also is one condemned by Tituba, a condemnation done in the name of saving herself. When Tituba tells that the devil has conned her into all of her bad acts, her "voodoo" and dancing in the woods with the girls is given a much more sinister motive. The stress is off her. However, near the end, we see Tituba tellling the people that she will be "flying away" with the devil, who indeed wants her soul and the souls of her helpmates.