What is the author's style in Calm Down Mother by Megan Terry?

There are only three characters on stage at all times during this play. Three women are first introduced only as Woman One, Woman Two, and Woman Three. However, throughout the play the women take on different roles and different names as they work through various mini-scenes. Sometimes the women are sisters; sometimes they are mother and child. At one point, one of the women spends the entire scene on the floor.