Fought with own sister for ni reason.

Friday (23/02)2024 this very small accident happened in my home. I work as a Assistant professor in private college. I live with my parents, I'm unmarried. With us younger brother lives. My younger sister elope 16 years ago , from then I was humiliated with adverse effect , we listened lot by people because of her decision. Like literally for me mentally trauma. In my absence always she visits my home. Last Friday unexpectedly unwillingly I met her in my home, she said something to me and both fought equally. She broke my spect. That day evening she went police station. And I had received a call from police station, they said me to give in writing what's that I dint know. Now I'm also hurt , without no reason she went to complaint, no I'm also thinking to complaint against her. For this my own parents are supporting her. Though mistake or event occured by both accidentally. Yet complaint is not lodged. If she lodge a complaint , then I'll also complaint against her. Please suggest me what I need to do in such situation.