You need look no further than Act One, when the girls are all together at the bed of Betty Parris and she suddenly revives herself. This of course is an excellent part of the play to analyse in terms of looking at the character of Abigail and how she manipulates and controls the girls and threatens them. She uses psychological fear to keep them in tight order and dominate them. Note how Betty reveals Abigail's involvement with witchcraft:
You drank a charm to kill John Proctor's wife! You drank a charm to kill Goody Proctor!
Abigail's response, after slapping Betty hard, is a desperate act of trying to limit damage when everything seems to be falling around her:
Now look you. All of you. We danced. And Tituba conjured Ruth Putnam's dead sisters. And that is all. And mark this. Let either of you breathe a word, or the edge of a word, about the other things, and I will come to you in the black of some terriblee night and I will bring a pointy reckoning that will shudder you.
Thus we can clearly see how Abigail was involved in witchcraft, but also how she tries to control that information and limit the damage to not implicate herself any further than she already is implicated.