DEFO think that Bapji killed someone that was close to Swara. Purpose/accident, I am not sure. But Asawari and Ahir helped cover it up. Maybe there is some terrorist involvement here as well in the cover-up (I am thinking Kethki?).
Swara may have seen it, and gone crazy.
The dance had a more deep story .She was too traumatized and an incident of one month can't cause this . Her past ,and the ghungroo incident is related still it would have diff angles