I was just thinking...wat if sadhna actually stood up to Vasu? Like for example:
Vasu: You always lie!
Sadhna: You lied you said you went to Delhi and you didn't! You are a mean and pathetic woman and NOBODY in this house loves you, even your own son...
You know, sumthin like that. If I were Sadhna I would use the Rajvansh house's weird ability to never notice their doors are open while arguing to eavesdop and blackmail Vasu! ( If you don't let me go out with Alekh, I'll tell everyone you said this...) But since Sadhna's too nice for that, atleast she could stand up a little for herself. Or maybe even walk out, seeing as that would teach Vasu a lesson cuz Alekh would go with Sadhna.