For separation sake will call it divorce or end of 6 months contract.
Then all extra Trivedi house trusted R proofs-cause wedding had to happen;now-cause it will be a case against her and have to add more weight to killing blame-all can reveal how those proofs were part of her big plan to trap Mohan Trivedi.
Makes sense:
-first pushed his wife to death (that seems to be the accusation,not that she killed Tulsi with her own hands but that she did what D did in reality-stalk MT,make T feel insecure until she decides to leave&die)...small problem is R lived somewhere else,for drama will ignore this
-later entered TH before it was too late-after he was engaged,before getting married;enough time to stop the wedding using make Mohan happy excuse
-built a strong bond with Gungun-the key to his heart,so much that baby only wanted R as mom,unfairly rejected his fiancee
-involved herself in house&office problems with enough dose of drama to get his attention
-married wearing Tulsi dress and wishing to have that mangalsutra gift for Tulsi
-various incidents when her life was in danger,made sure Mohan will be worried&start falling in love
In reality only few things were done by R on purpose,to achieve the "breaking Mohan trust&RM relationship" goal all will be taken as well planned. Which is fine,about time she learns she could have done everything different and hearing-trusting ghost words was a mistake. And Mohan has all the time to become fine again,check if R is innocent or not,find the real reason of his unhappy life.