Razia is probably her step-mother who wanted to get rid of her.
Zoya's father, who is apparently alive, is none other than Humera's father.
This could explain why Razia is trying extra hard to secure Humera's future as she knows there might be some competition.
Unless until, Humera's parents are not at all related to Zoya and instead have just accidentally or intentionally (for wealth) got rid of Zoya's parents.