Why is Rubina being so dominating?

There was a food crisis in the house and Rubina started dominating everyone and telling them how much they are supposed to eat. Which led to Eijaz saying that he is very well educated about nutrition so Rubina shouldn’t bother telling him. After this Rubina shouts at Eijaz and says that she’s sorry that she showed concern for his stomach. Eijaz says did I ask you? It’s my mouth, my stomach so stops it. Even Aly asked Rubina why was she stopping him from eating what he wants to? Rahul even says Rubina will decide how much we will eat and when we will eat like we are kids. I feel that they are right and Rubina has no right to control what anyone eats.