I used to think so too until I found out Mamu's involvement in the fire too.
I think Zoya's dad probably worked in the factory that caught fire.
From this point, two things might have happened:
1) Zoya's dad witnessed the actual fire being set by the evil duo. Possibly an arseny plan. They might have then set fire to the house with Zoyya and her mom, purposely sparing Zoya. They would have then threatened him saying that if he doesn't "disappear", they would kill Zoya. So for Zoya's safety and so as not to let them use her as a tool, he left her.
2) Zoya's mom worked at the doll factory and knew the conspiracy. So they burnt her along with it but Zoya escaped or was rescued by her dad. Seeing this, Evil duo must have once again threatened him and he must have left to protect her.
Failing this, Mamu Jaan might have tried to burn her along with the factory to bury his secret extra marital affair that would shame him.
Or the factory and the luxurious house that belongs to them was Zoya's parents and they probably cheated them. Then plotted to kill after being discovered, resulting in the end outcomes of 1) and 2), or Zoya's dad has lost his memory after being injured D: