Who is Bernarda, Bernarda Cabrera from Of Love and Other Demons and what is their importance?

Bernarda is the second wife of the Marquis. Bernarda is a shrewd business woman until she begins to decay. She is sent by her father to trick the Marquis and marry him. To do this she gets pregnant by the Marquis and has a daughter, Sierva. Bernarda really loves Judas Iscariote and gradually destroys herself with Judas, and even more after his death with fornication and drugs. Bernarda also hates Sierva and totally neglects her.