She has to understand one thing. Whenever she is with Shaurya the sufferer has been Payal. When she became friend with Shaurya Payal was gang raped.
When she got engaged with Shaurya again Payal suffered. Atleast she should understand getting near Shaurya is not the way to get justice. She will only end up hurting herself and Payal more.
Mistake was not letting Dev know about Payal. Mistake was deciding to get engaged to Shaurya. I don't think Sakshi would have cared about Payal if Durga was not hell on entering GM as bahu.
See it is next to impossible to hide one's true identity behind a mask for long. People who have known the person will def suspect.
Sakshi and Dev are now on the same page as far as her identity is concerned. Sakshi knows Durga doesn't love Shaurya, Dev too knows Durga doesn't love Shaurya.
Seeing Durga Sakshi remembers Nithya, everytime near Durga Dev feels strongly for her, he has also been thinking whether he is seeing Nithya in Durga.
Next level is , is Durga Nithya. For the time being this is where Dev can have an upper hand as Sakshi after seeing Nithya's death certificate is not thinking along those lines. She just thinks Durga is somehow connected to Divya Bagchi or Mitras.
But Dev can think and look for proofs.