Who is Susanna from Welcome to the Monkey House and what is their importance?

Susanna is a nineteen-year-old actress staying in the village for the summer. She has a job at the summer theatre there. Every day she follows the same sensual routine: she gets up at noon, goes out onto her porch, feeds her cat, puts on her jewelry and generally puts on a feminine show before she walks down to the drug store. The villagers seem to love her and her mystique. When Fuller attacks her, she first responds dumbly, unsure of his intention, then is humiliated by his accusations. She is stripped of her confidence.