If Sandhya is so intelligent to be an IPS officer, she could have interrogated about the police report against her MIL. She is accused of it, which has a huge impact on her being negative, so she should've sorted it out first, which is the first and foremost thing to do even before learning to do house hold chores. Is she doesn't clear that out, no matter what she does, she cannot earn the respect and affection from anybody in the house, leave alone bhabho...
On the other hand, I know its a daily soap, so CVs will take their own time to sort this out. Otherwise, the show will end in no time...