My hunch is that after kidnapping payal, sakshi will expose her to some durga-shaurya interactions.The aim of this would be to create a rift between payal and durga and to compel durga to choose between shuarya and payal.
At this stage all sakshi wants is to get durga out of the goenkas' lives. She does not need blood on her hands.(or not any more than she may currently have to her credit).
If sakski is as smart as she likes the world to be believe, then she will act proportionately to deal with the threat from durga.At present sakshi has no idea of the exact nature of the threat from durga. All she knows and feels( her instincts) is that durga is bad for shaurya and her family!
But we know that sakski is blinded by her own self importance and ego.her blindness and overconfidence will be her downfall as has been pointed out by several members in the forum already