Cousin sister full of derogatory behavio

My cousin sister she is in anger mode everytime not willing to respect anyone(elders / younger) fight with everyone in their relation always use cheap words  in anger in this  way she terminated  her relation with mother,father,sister,and in laws are also  very tensed she will misunderstand everyone and fight with everyone always in a state of anger 👿 and negative feelings not interested in any work except quarreling with others full of laziness  even she will keep her surrounding also untidy we also done mri scanning as per our nuerologist suggested and and reports are also normal everyone hate her due to her evil nature she always think in a negative way and everyone is afraid to talk with her is there any way to reform her in a positive way medically