Uncle's daughter always file complain of being harassed

Hello Sir, My father is total 5 brother, of which one uncle always fight for small-small thing and put his daughter in front to fight. She always start fighting sometimes with in house and some time outside, and then go to police station and file complaint against us for fighting with her. She being a girl, police seems to be in her favour. Even if we file complaint against her, Police threatens both party for not fighting. Now we are in such a dilemma situation that if She starts fighting with us, what to do as Police has said not to fight otherwise they will arrest us. Also She always threatens us that she will file police complaint for attempt of rape against us. We have also tried filing complaint for this threat, but Police said "have u done that, no right ? Let her file complaint for attempt of rape then we will see what is required to do". I specifically need help how to proceed when my uncle and her daughter starts fighting. Should we let them beat us as police has threatened us not to fight.