As per precap from tonight, looks like Sampoorna seduced Binoy to a one-night stand and then blackmailed him into marrying her, which is why he was leaving in a hurry in the previous episode and Sampoorna walking down the stairs after him.
I know Indian TV shows are stupid enough not to care about continuity but from the looks of it, the time taken by Anirrudh to heal was when she planned the wedding.
I assume she will be a full time vamp now but I feel extremely sad on how the CVs have destroyed a good character for the sake of masala and drama in the show. I really liked her!!