She has gotten a biggest lesson, I feel. She is a sin in the name of the mother though, but kids can't stay without her mom. I guess sahiba said parivaar not her mother... In the precap.
I think it is bad enough that she has played favouritism among her own children and after everything she did, she's definitely a fraud too. But I think whatever happened, needed to happen to open her eyes. Seerat running away without caring about her family's reputation was an eye opener moment for Santosh. Right now everyone is mad at her, but I think her repentance is true. And she is really going to value Sahiba and Keerat over Seerat from now on. Seerat is done for as her favourite daughter.
@Bold - I think for Sahiba, her parivar and her mother aren't separate identities. She counts her mother in when she talks about her parivar. Today also she said if only my family hadn't wronged you people I would have given a fitting reply. She was talking about her mother but said her family. She is hurt & angry but wouldn't cut ties with her Mom. However faulty Santosh is, she is still her mother and Sahiba isn't selfish or ungrateful like Seerat.