If we start from beginning of the story. She

born in family where they prefer boy over girl.

No one was happy except her parents.Ofcourse father was busy at work so her mother was alone to take care of her . And no one let her....

She have to do all house chores even if her Daughter was crying of hunger .That little girl grew up in suppressed environment .Where she thinks before laughing cries in silence and degraded herself according to views of her surroundings and her only friend was darkness she felt comfortable in darkness .Because that was the place where nobody can judge her, no one can remark her, no one will see her crying. Because even if she laugh , wear nice ,makes right choices they'll make fun of her like she have no right To Be Her . Yep they show love and care only when they intentionally wants to spoil her thoughts and habits.

after ruining all of her childhood finally her father decided to move to another city