2-By hiding the truth she will cover her daughter and son's mistake ,without getting degraded 👎🏼by samaj and can have Dev plus his money.
3-Dev blindly trust MR and he will never believe anything against her even if it's the truth .So by her staying @ PF home there are 90% chances of Dev hearing the conversation between mother daughter about him 😲and he will start investigating or will ask Rads to help plus Rajan can mention something about the truth and hopefully he will remember things and kick out so called wife and MR.😡