Sona understood that she will remain a married virgin if she trusts Dev to take initiative in making arrangements for their first night. So she took the driving seat for now. Dev, the previous driver, is not very efficient in overcoming the obstacles created in the journey by the passenger, Eeshwari, because he is driving for too long and is a little resigned. Sona on the other hand is a new driver with fresh perspective and objective thinking. She must be able to identify the source of trouble and fix it easily. She is able to bond with other passengers of the bus, who are eager to help. Gaadi Nikal padi. But, she will be tired eventually and at one point expect the experienced driver, Dev, to step in to help. Hope he will be ready by then.
Honestly, I didn't find Sona's "lie" a big deal. I don't like lies at all and I always believe that one should never lie unless it's a life and death situation. But here Sona didn't plan to lie, but the circumstances lead to hiding things from both Dev and Eeshwari. She wanted to surprise Dev and she was uncomfortable telling anything related to their married life to Eeshwari for various reasons. It's important to make Dev taste the forbidden fruit so that he trusts Sona's love for him more and will take initiative in spending more time with her.
