Durga had planned for two years, she has a strong support from Dayal and aakash, no one knows who she is as everyone considers Dr Thakur's daughter whose priority is well being of poor-helpless people. Still, she has not been able to maximize...one of the main reasons is landing of the DEV and she seeing her picture in the locket which was gifted to him by her. This has somewhat sidelined her aim and if she is moving forward with it, then we clearly see how much she has to force herself. Her repetitive phrase "next time I have to be careful" shows that she is not smart enough to assume her enemies future actions in advance...