In Act I, what truths come out when the adults leave the girls alone in The Crucible?

A couple of things emerge when we see the girls alone. 
Initially, we know who is the ringleader of the girls.  Abigail emerges as "the brains
of the operation."  She is the one who seeks to gain the most from the girls' time in
the forest and is the "enforcer" to make sure everyone sticks to the plan.  From this,
we also learn that she is the most dangerous, in that she can compel others to her own
will.  Her duplicitous nature is on display for all to see because when the adults are
away, we see a forceful and insistent side that is not something to be dismissed.  The
other element we learn is that while Abigail is the strongest, she is able to exert this
force because the other girls are afraid of her.  Mary Warren, the weakest of the bunch
is "put back in line" through Abigail's "persuasiveness."  Abigail's power is magnified
by the fear and hold she has over others.  We see a "Mean Girl" tendency in how the
girls interact with one another, whereby female intimidation is calculated and
deliberate.  Finally, we understand through the narration that opened the scene that the
manner in which Salem parents envision their children is opposite of how the children
might actually behave.  The girls demonstrate this when the adults leave in that they
are determining how to evade punishment and "what story to tell" as opposed to actually
feeling remorse for what was done as a transgression.