Based on what Mary says, making the poppet was just a way for her to pass time in court. She states, "I had to sit long hours in a chair, and passed the time with sewing." This is the reason she gives as she initially gives the poppet to Elizabeth. Later, when more aggressively questioned about the subject after Elizabeth is arrested based on its "evidence" Mary is bewildered. She states, "I meant no harm by it sir...I am entirely myself...ask Abby, Abby sat beside me when I made it." The stage directions give us more clues, words such as "bewildered" and "not understanding the direction of this". All of this seems to point to the fact that Mary passed the time sewing in court; what she sewed was a poppet, and she gave it to Elizabeth as a gift, nothing more. There was no malintent, plotting, or scheming involved. She openly and immediately gives the information that Abby sat next to her; if she had been in cahoots with Abby Mary would for sure not have mentioned that, in order to lend credibility to Abby's claim.