@Latha thanks for the WU.
My prediction on the promo I hesitate to make because the CV's usually do the opposite. Anyways here is what I think
They didn't show Shivani eating just touching the plate why do I think Shivani will observe the fast and not listen to Raghu. When Sumi tells everybody that Shivani broke her fast and Rashi reveal that she didn't break her fast Sumi will again feel like she is being made a fool of and get even more vengeful.