Who is Olga Sisovsky from The Prague Orgy and what is their importance?

Olga Sisovsky is one of Prague's greatest writers. The Czech people love her stories, but she stops writing after her husband leaves her for another woman. She is married to Sisovsky and has a propensity to be a heavy drinker. Once a very beautiful woman, she is now old, bitter and angry, consumed by anger over her husband's betrayal.