@mallika:
You are right. Veer would be a good grounding force for Meghna and she would be worry less abt Sharda with Veer around.
But I feel that Meghna is the way she is becoz she's the eldest, with no dad in the house who could take care of her mom and them, so she became like the protective one for her mom and sister against the world. This is why Meghna is so aggressive, whereas Naina has always been shielded from problems