Coming to Sanjana, I think , there is a possibility of her being a part of Mihirs dark past, creating more problems for mi-mi, while Ashoka moves closer to Mihika.
Initially,we were told , that Mihir had a bad past , and Raman got him out of the mess. Ppji was already MIA , but Shagun knows this and for some twisted reason is trying to break her brothers wedding and dragged Sanjana in.
Why is her last name arora? She's probably trying to fake being Mihirs ex-wife maybe? But she was ms girlfriend and he broke up with her because things were bad.
Anyway, this may it may not happen. Who knows what the CVs gave planned? Till then, let our imaginations run wild :)