@Whatever Unfortunately she doesn't die.
Spoiler!
Isabella is taken to a convent due to the cheating scandal with her and Cesare. Three years later Isabella returns from the convent (from the Cesare scandal) pregnant with Ottavio's child. During the 3-year time skip, Ottavio sent a carriage so she could leave the place. She is now married to Ottavio and wearing his title as "Countess Contarini." Her baby is born but they keep quarreling, not to mention Ottavio is full of debts due to breaking the engagement with Camellia di Castiglione. She's been enjoying a high status at society thanks to Ottavio's promotion as judge.