I really needed to dramatize and clarify that Rachel was taking strides towards her own healing and her own sobriety - and that she was actually thoroughly frightened about what she may have done.This was something that was so beautifully done in the book [The Girl on the Train] through inner monologue, but I couldn't just have a whole film filled with inner monologues. So going to Alcoholics Anonymous was a very simple solution to that problem.