My Sister’s attitudes

In spite of the fact that my sister wants to do everything her way, I was not expecting her to exceed her limits to an extent where she would insult my mother. After she had arrived late and entered her room and while my mother was speaking with her, she locked the door of her room and started to change her clothes. My mother started to shout at her and ordered her to open the door immediately, but it is a pity that my sister did not show any reaction. I got the impression that she wanted to change her clothes and go immediately to bed. When my father heard my mother shouting, he waked up from his bed and came to speak with my mother who was angry and knocking at my sister’s door. He asked my mother about what was going on and my mother told him “it is almost two o’clock in the morning and your daughter has just arrived. Who will marry a girl with such behavior who is staying for such a late hour?” My father did not care about what my mother was saying and he immediately knocked at my sister’s door because he wanted to speak to her. The strange thing is that my sister did not care to open the door for both of them and instead of showing any reaction, it seems that she slept in her bed. My mother kept knocking at the door. Then after some time, my sister opened the door for them. I was standing behind them and when I looked at her face, I noticed that she is not showing any concern about anything. She was trying to tell my mother indirectly that “I do not care about your reactions and whatever you try to do.”