Btw why did they deny her in the orphanage itself? Is there any such rule? Or Virat had told the orphanage?
Anyway, contrary to popular opinion I don't think Sai will give up on Vinu after finding out the truth. Not sure if she'd tell everyone the truth or to Vinu but she'll want to be with him, spend time with him like Virat used to do with Savi. If Sai had known from Virat right now then she'd have herself sacrificed Vinu but not after Virat himself digging bigger grave once Sai learns not only Virat knew yet didn't tell her, then tried making sure she doesn't find out the truth that will gonna blow her off imo. They're repeating Shruti track in a twisted way. He's making sure Sai doesn't get to trace anything about Vinu.