Apparently she gave her reason to why she doesn't want them to cook. Plz watch it again. She said that she doesn't want them to have a plus point that they ll use later saying "we made food for you guys!" which happens all the time in BB. So Teju was absolutely right in saying that khana to main hi banaungi". She also said that it is not abt her ego, but everyone's food.
And why it comes down to rules when it is abt someone you don't like. Others have broken rules too, in fact broken properties!!!!
p.s. I do not hate Shamita. She is right at her place, but Teju is right too.
Also one can have many shades of personality. She is fierce, brave, funny, energetic, good at making points and arguments. It is actually refreshing to see someone who has shown all shades in just a few days. BB is a very long journey and everyone will have time to see all that.