I know as a mother santo wanted to protect her daughter but by doing that she also destroyed birwa. The crime birwa committed was heinous even if it was to safe her father. Murder is not a crime one can just forget and walk away from because someone said so let alone a child. Birwa was in a state of shock after she stabbed arjun, I think santo even had to slap birwa to bring her back to reality. Once santo when to jail she should've confided in somebody like shanky if she didn't want to tell her husband. Birwa needed emotinal help to deal with what happen since there was none birwa when two steps ahead of her father by drowning herself in work and killing herself from all emotional tide. Birwa and Santo were the light in that house with them gone all they had was darkness. Everywhere birwa probably when in that house she saw the venom spoken and hatred in their eyes for her mother. The girl didn't have no choice of survivor but to kill herself inside if she wanted to fulfill the promise she made to her mother. Birwa is too far gone to even care or feel that's why she so mean to the person who she's care about most in the world her mother. If we can go by today episode birwa is on a path to some form of emotional meltdown.
With all this below what chance did birwa have of being normal.
Baa & Babaji....Too old to be of any help.
DM..Lock himself in the room and cut tides with everybody.
Hiten..I had to take on father responsibility while still finding his own way.
Moti..The biggest pig in the family whose not fit to be called mother, forfeited her own marriage to sit in her brother house to make sure he doesn't have a wife so they can grow old together like old maids
Khemi...Grieving screeching widow
Toral....I had to step up to be a mother figure.
Kaddu....Divorcing her husband cause she suspecting him of cheating with santo in prison.