In "The Crucible" Act 3, what evidence is presented in Act 1 which explains Abigail's control over the girls in Act 3?

In act one it is obvious that Abigail has a lot of power because she initiated their dancing in the woods. She has power, not only over the girls, but over the Reverend too. She and the Revered suggest that no one speak of the negative rumors about her. She had recently been fired from her position at Elizabeth Proctor's. In addition, no other family had tried to hire her.  Goody Proctor suggests that Abigail is an evil girl.  Parris asks her if she did something wrong. Abigail denies any wrongdoing. This section in Act 1 suggests that Abigail is controlling the girls which is why she was let go.