Saanjh growing crazy here is completely justified because of two main reasons.
First she lost her father, the most important person in her life.ðŸ˜
Second her guilt of losing her dad because of unnecessarily getting involved in the arjun - maya- ayan fiasco...😔
Losing your father and the guilt of the same can drive anybody crazy ...
If mayas madness and obsession for arjun is justified, if her attempt to murder her own mom for her love is acceptable , if the love bites on her body by another Man And not her husband in the name of her 'love' is legitimate, THEN SAANJHs actions are TOO REASONABLE HERE .
Obviously loss of a parent (and the guilt of the same) can lead to serious mental breakdown, (post traumatic stress disorder) and saanjh has played it upto perfection.