I think Durga was supposed to be a grey character who was changed to a full-blown negative character. She was supposed to change and be in favor of Guddan in the future, while Saru and Lakshmi would be against them as they both were lacking morals and principles unlike Durga. Lakshmi was a very cunning one and wanted control just like Durga and Saru but they turned her innocent and positive. Somewhere, Saru too was not that evil, they turned her into a thief and what not. Initially even sons got good scenes. Didn't we all think the same? CVs changed everything due to TRPs I think.