In Act 2 of The Crucible, why does Mary Warren think Elizabeth should speak civilly to her?

The girls at the center of the trial quickly become taken
with their own importance. They have found that they wield a strange power, one that
they could not ever have had otherwise. They are celebrities of a sort because of the
trials.

I do not know off-hand how true this is. I would
like to think this is a fictional element Miller used to create a parallel between the
Salem Trials and the Senate hearings run by Sen. McCarthy. People who were willing to
name communists during the Red Scare wielded a similar power and that led to more
widespread panic. We must always remember that this was Miller's real
message.