Since your grandma (the queen) died because Hailey killed her, your sister, Ava was mad at her. She experienced mental illness and mental unstable because of hating Hailey too much.

She was in her room, her hair was messy. She no longer wear tiara or even her pink and white ribbon at the back of her hair. She screamed a little.

She didn't talk or go out usually from her room. Her personality and voice demeanor changed

(Author: no more Miss nice Ava 😔)