No doubt Pratigya eating the food has left some sort of an impact within Krishna. We saw so many emotions on his face--shock, disbelief (that she's actually eating it), regretful and in the end hurt--he couldn't bear to watch her eat it so he had to look away.
Onto my point, why did Pratigya not say those words out loud before eating the food? Yes, the action itself was astounding, but the words are needed. Krishna needs to hear the I love you and that she'd be willing to do anything he wants for his happiness.
I totally get that Pratigya is probably scared of Krishna not believing that she loves him, however, she has repeatedly told him that she's not acting so she can repeatedly tell him she loves him, etc. When is this confession going to happen? What are the cts waiting for? By the preview, we came to know that SS and Amma are returning. I was hoping this confession and them growing close would happen before they got back home.