For me, Nandini is a kind of person who thinks that the world revolves around her only. For some reason, world owes her everything without her owing that much to others.
Her definition of being a nice person is flawed on many levels.
I had a friend like her, tried to understand her psyche for too long and reached a conclusion, sadly, she didn't prove me wrong. Everytime she would do something wrong despite prior warning, she would cry and say why does it always happen with me, I didn't know what I was doing, you will always be with me to support, I am too bad to hurt you like that even when you cared so much for me. Crying was her weapon of her choice and then the next moment she would be all good.
As if she had no idea of what she was doing. She was just doing it without thinking of the consequences. She used to play on the attention guys used to give her. Nandini's psyche is twisted too just like that. For norml people, that's the definition of extreme selfishness and ignorance.