Dumbkedorvashing Stories

Voldemort attacks on Halloween while James and Regulus are out, Mary and Lily are watching the girls, Estrella and Ariel. Dumbledore makes a mistake in naming Ariel the girl-who-lived and sending Estrella to the Dursleys without her parents permission. Estrella is treated like a slave at the Dursleys, but what happened even she meats a mysterious wizard who takes her back to the founders time? What will happen when she comes back?