How does Miller construct Abigail Williams to be the most evil force in the play?

She is a malicious, vengeful girl who, in an attempt to protect herself from punishment after Reverend Parris finds them dancing, instigates the Salem witch trials and leads the charge of accusations. Despite her accusations, Abigail is an unabashed liar who charges witchcraft against those who oppose her, even Elizabeth Proctor in an attempt to take her place as Proctor's wife. Abigail's callous nature stems partially from past trauma; she is an orphan who watched as her parents were murdered by Indians.