Who is Rosa Litvinoff from The History of Love and what is their importance?

Rosa Litvinoff is Zvi's wife. She befriends Zvi after seeing him several times in cafes in Valparaiso, Chile. The two start dating and eventually marry. It is Rosa who encourages Zvi to publish The History of Love, and it is also Rosa who later realizes that the book was not actually written by her husband, but his friend Leo Gursky. She arranges for Leo's manuscript to be destroyed in a flood in order to protect her husband's reputation.