Kangana's character from what I saw in the previous episode seems to be inspired from the movie Raat aur Din, where Nagris Dutt plays the character of a married woman who suffers from multiple personality disorder. By day, she is a typical Hindi homemaker, whilst at night she calls herself Peggy and walks the streets of Calcutta.
I am sure Sumitra knows about Kangana's disorder.
For more details check out https://en.wikipedia.org/wiki/Raat_Aur_Din