I dont think you understand.
India has already given MFN status to Pakistan. Giving MFN to another country boosts that countries export competitiveness in your market. Now even after giving Pakistan MFN, Pakistan has a huge trade deficit with India. Were India to withdraw MFN to Pakistan, Pakistan's exports would fall.
On the other hand, India without having MFN from Pakistan enjoys a huge trade surplus as most of India's exports reach Pakistan via UAE. So continuing to not give MFN to India does not make any difference. But if India was to retaliate economically - by withdrawing MFN, Pakistan would suffer, not India.
That is due to protectionism and MFN would matter in the first place if there is trade.