What is the main conflict in Overtones by Alice Gerstenberg?

Alice Gerstenberg's Overtones is considered the earliest example of a play that dramatizes the unconscious on stage. In it, Gerstenberg uses two actresses for both Margaret and Harriet to represent the single character of Margaret and Harriet. Each embodies a disparate part of the character's personality; or, to put it in Freudian terms, one is the id and the other the ego. In Overtones, Harriet and Margaret are the cultured and refined selves, while Hetty and Maggie represent the wild, primitive desires of these same women. Using two women to play one character was a unique convention that had not been seen before