Not having read a more detailed update or seen the last episode, I can't be sure of what to think or say...but from what I have read, I don't blame Shubra for listening to Kaveri again. As much as I know of phsycology and human reactions, Shubra is in a state of shock at the moment. Having recently suffered emotional and physical trauma at the hands of Karan, had little time to recover from that only to be faced by him again, dangling her child from the terrace now when she has gained a greater sense of responsibility ... her mental stability is at a very weak point. So when a person is repeatedly telling her that this was no accident, it was her fault, her mind will willingly take on that explanation.
Like most in this section, I am rather frustrated at Brijesh. He has descended from the status of a Rajput to that of a Ronabhoot. He now serves to do Urvashi's bidding.