6) Explain what Mistress Hibbins means when she says to Hester “Dost thou think I have been to the forest so many times and have yet no skill to judge who else has been there?”

Mistress Hibbins parades herself as a witch, but the truth probably is that she is a keen observer of humans and knows that Hester has been there. It is likely that she knows that Hester is there with Dimmesdale (or occasionally Chillingworth) and thus makes certain assumptions about the various relationships.