I was scolded every time it was my mistake. And I am proud my parents brought me up like that because it makes me who I am today. I personally don't feel Mona is going through any emotional abuse RIGHT NOW, she may have in the past tracks, but currently not at all. She has the power in her hands but is refusing to use it. So if she is standing their and listening to Ba and Phui and Anchal, well its her own fault.
First of all many of us don't respond very well to scolding, I personally respond to empathy, love and understanding regardless of the mistake, scolding will totally turn me off. I will shut off and become defensive. Mona is not only scolded, she is yelled at and is butt of extreme anger and is abused regarding her background, her lack of gujju skills, her being Punjabi not vaishnav gujju. Mona is not accepted in the household, she is an outsider and treated worse than a servant. Phui sings songs to abuse her and sarcastically calls her Mona Rani.
She tried to fight back but she lacks Gandhi cunningness and abusive skills.
To your point about scolding turns off, any human would be not be happy by yelling and scolding, thing is when your shutt off your brain at the time of scolding your ears are still listining and when the brain resumes it thinks about what happend and then decides it self what was right and wrong, and from that point Mona knows taht what ever she has done to protect or with respect to take care of some one she has taken the support of lie and hiding stuff from family, so whenever she gets scolded or yelled she knows or she expected that in advance as she had lied. And that is the reason she never answers back... She does try to explain her self but she has lied so much so far that no one wants to hear any mor lie so she is never given a chance to explain her self.
If she was really being abused taht much then why is she fighting back for her rights with Anchal... because she knows that Anchal is wrong and no one to take Mona for granted... Every one in the family thinks taht Anchal is a very good girl so every one supports her but now that Amabji is smelling something in wrong she has stopped supporting Anchal and in a silent way she is supporting Mona.