I wanted Swara to confide in Sanskar about finding pictures on laptop @ home. But when it comes to behena she becomes very protective & she treats things differently. Swara is different with different people esp Sanskar & Ragini. She gets mad @ Sanskar may be because she feels closest to him. And with Ragini she is ready to defend even her worst crime.
Both of your reasons are acceptable even though the 1st one only in TV land in current days of modern technology.
I would like to see Sanskar in action. Cvs can surprise us by making us & Adarsh believe that he is away.