Based on current narrative trends, a modern superheroine turns evil via one of four updated paths:
The most effective updated stories lean into the idea of systemic failure. The heroine doesn't wake up evil; she is pushed. She saves a city that hates her, protects a government that experiments on her, or loves a partner who lies to her. The "turn" happens when the protective shell of heroism cracks, revealing the raw, angry human underneath. superheroine turned evil updated
Old version: Lover dies → grief → villain arc.
New version: Systematic disillusionment with the very concept of heroism. Based on current narrative trends, a modern superheroine
Modern catalyst ideas: