Character Analysis
Sarah plays a small but significant role in Part III, when she interrupts Gabrielle and Michelle's ridiculous presentation on Ionesco's play in order to exact revenge. She needs to get back at the little snots for acting morally superior to her when she asked to borrow notes for a day she skipped class.
Sarah is not Madame Raphael's favorite. In fact, Kundera makes it a point to tell us that she's a Jewish girl (as opposed to American or any other nationality) to emphasize her isolation from the cool kids. While Sarah gives the girls a couple of good, swift kicks in the bum, she doesn't get the last laugh.
Literally.
Instead, Madame Raphael redeems Gabrielle and Michelle's shame and floats away with them into the heavens—a little exclusive society of their own. These ladies' heads are so full of hot air, it's no surprise they couldn't stay earthbound.
Kundera himself thoroughly identifies with Sarah's exile: "I know that Sarah exists somewhere, Sarah the Jewish girl, Sarah my sister, but where will I find her?" (III.9.6). His own disorientation and solitude unites his suffering with Sarah's frustration.