Imli can only use Anjor against Chakor if they can't reach her, the mohar and being bandhua is all illegal, they are in place because of power, but now Suraj isn't helpless, so once he knows he's Saanvi, Imli can't stop him from taking her and if she wants her mom with her, he can bring her to live in haveli. I don't think her mom will try to take her away from Sukor, her dad will do whatever Gumli will tell him to.
I think Imli will try to kill Anjor when she realizes she can't use her and then Sukor will realize she's Saanvi. They don't need Imli to know this, her mom probably still keeps her birthday dress.