Guys this is my Prediction so it might turn out to be wrong or right so don't throw Chappals on me.
My guess is that Soumya is Pakistani and Nimmi is surrogate mother of a Pakistani Couple but due to some circumstances that Pakistani Couple vanish and thus Nimmi takes her care after all she gave birth to Soumya.That's the reason behind title "Shakti Astitva Ke Ehsas Ki"