In this case, first you should know the reason why you had fought  with her than you can tell this to your parents and ask your family members to talk with her parents. Having fight on small issue is quit normal but inorder to solve that problem on your own you are taking support of the powerful men and asking them to be violent is wrong. This denotes violence in public that is criminal act. Try to solve it from your parents help then if the case is not solved ,take it to police station try to make FIR report.