It was previously stated that Savi would never be able to bear children of her own and that society would therefore view her as infertile. She won't be able to handle the thought of living alone since she will be so lonely.
As her son Rajat is a single father, Mrs. Thakkar was previously raising her granddaughter by herself. Since Rajat doesn't want to look after his daughter, Sai will grow up to be perceived as an extremely lonely youngster.