Do you have any suggestions on how to play Becca in David Lindsay-Abaire's play Rabbit Hole as she is so distant?

The traits that make Becca difficult to play are
counterbalanced by the causes that explain them. On the negative side, Becca is isolated
and unconnected with other people. She cannot psychologically grasp how people go on
with their lives in such a normal way when she is derailed from the normal aspects of
life by overwhelming grief and sorrow. In order to find a way to develop the isolation
and distance in her character, first fathom the pain and meaning of her grief and
sorrow.

Another negative is that her sense of humor is employed
against other people rather than to draw others to her and bind a relationship through a
shared laugh or private amusing anecdote. Incidentally, this is another one of her
traits that further isolates her. To find a way to develop this biting, unpleasant humor
in her character, first fathom how small and insignificant daily troubles, pains and
sorrows seem to enormous ones: first you must also recognize that troubles and suffering
come in degrees of greatness and shades of horror.

Finally, recognize
that under her distance, her isolation, and her caustic humor, lies the true essence of
her being. On the positive side, she is truly interested in her sister's well-being,
even though she nags and criticizes her. She is truly sympathetic of her mother's loss,
although she sees that the circumstances of their losses may not compare. She realizes
that other people's grief and suffering, especially Howie's, though having different
causes (maybe lesser causes) than hers are no less painful and complex than her own:
“You’re not in a better place than I am, you’re just in a different
place.”