As far as I know, Indrani hardly ever acknowledged her first borns (from college flings) she left them with her parents to live her life, and pretended they never exist, so when she found out sheena was in relationship with her step-son. She killed sheena to hide her past, moreover the very night she killed sheena , she also tried to kill the twin brother by intoxicating him. On document sheena disappeared and it's the case of no body, no crime.
What part of it did the web series messed up. Last I checked Indrani was claiming that her friend spotted sheena on airport or something. Indrani is a media person, she excels in department of saying lies with straight face.
 
 
 
 
 
 
 
 
 
        
          
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