Ok today I came to the conclusion that Bani wants the money to save Jai. WHY?
Firstly yesterday she said to Massi that "What if in fuuture Jai looses all his property then who would take care of my child" - That means she thinks that someone is after Jai's money and he is from his own family.
Secondly today she said toTarun "I have filed for 50% but I want you to get me as much as you can" That proves that she wants to save as much property as she can as her right as a wife....And very soon after everything is out in open she would give it back to JAi.
I think it is RAASHI who has played a very important role in this. The file she put in cupboard ..she must have read it and told Bani about Ranveeer's plan.