Final answer:
By the end of Act 3 in 'The Crucible,' Abigail Williams successfully manipulates the court, turns Mary Warren against John Proctor, and strengthens her position while falsely accusing others of witchcraft.
Step-by-step explanation:
The question refers to Abigail Williams, a character from Arthur Miller's play The Crucible, and not Abigail Adams or any other Abigail from the provided information. By the closing of Act 3 in The Crucible, Abigail Williams succeeds in manipulating the court and furthering her own ends by accusing Mary Warren of witchcraft. Mary Warren, in turn, recants her confession of Abigail's lies and helps to incriminate John Proctor, helping Abigail in her quest to rid herself of Elizabeth Proctor and to take her place as John's wife. Her manipulative power over the court and others around her is fully on display as she navigates these complex social and legal situations with cunning and deceit.