She eventually realizes she can't change the things which are unchangeable. If Matt governs the overall action as narrator, the action of the chronicle is, from the beginning to the moment when Matt realizes he can't make sense of things, to a large degree Bette's. If Bette wants things to go right in terms of her vision of the good and happy life, the others contribute to the obstacles that make things go wrong. Of course, as Durang points out, Bette does not have the training or background to handle the problems which arise. There are no connections between people in the play.
Little compassion is found in family, church, or medicine.
There are many more particulars that come out as we proceed. The play is both angry and forgiving. But it is for me much richer than an angry while clever adolescent shotgun blast at an absurd world, for it moves beyond pubescent anger to a mature resolution of love, compassion, and understanding.