Anu has always been very mature and understanding. And she never got the chance to be the kid she really is. With the entrance of Maaya, she suddenly became stubborn for her presence in her life. She never threw a tantrum before. But now she does. It's her need to stay close to that one person who gave her the love she craved.
Unfortunately for MaAn, it's Maaya who gave her the love she craved. I don't know what her majboori was. But if she doesn't repeat this and can give Anu the childhood that she deserves, I'm all for her taking Anu away.
But I also feel she can prove to be a fraud. Whatever the case, it's MaAn, who gave her the room to enter in their lives, otherwise why would Anu demand for her.