"There was a sudden emptiness within me after I got the news that my first film bagged the national honour. It can't be defined," Churni, who is the wife of Kaushik Ganguly said.
"Nirbashito", feted internationally at different festivals, is based on the life of exiled Bangladeshi writer Taslima Nasreen and her cat but the names have been changed in the film.
Recalling her encouraging response to the film at different film festivals including the Mumbai International Film Festival, Churni said "I am happy the festival audience could connect with the film. Now getting the national honour means it is being accepted by our own people."
"The best director award to friend Srijit (Mukherjee) for Chotushkone is also a proud moment for all of us. Three Bengali films got the national award, it makes us proud," she said.