to escape harsh punishments. She is saying what her 'superiors' want to hear. They want to see/hear witches so she is giving them witches.
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Tituba confesses to witchcraft since Abigail and the others were claiming she had committed the crime. Tituba was wanting to escape the extreme punishment of whippings and being hanged and so she took the easy road out and just confessed to a crime she had not commited. The punishment was lesser and she was allowed to just go to church to get the devil out of her instead of getting killed for "witchcraft".
she is threatened
She admits in order to avoid further punishment, and telling Salem what they want to hear. She believes that by taking the bullet for Abigail and her friends, she is going a good thing and is the first person in Salem to confess to witchcraft. -R.S.
witchcraft
shocked