I agree with Ranju here. I am sure Kranti was sad and angry with what happened to Bauji at the party because she considers Chaijee and Bauji as the parents she never had. She is willing to go to great distances for them and she even forewarned Raj and also Bauji that inviting the British to the party wouldn't be a good thing.
As for that juice thing, I think she did good. After all, Takla called Raj 'a loser'. Did we expect her not to do anything? That actually would ahve been bad.