my sister's so fucking pathetic fr

my sister's a sophomore in high school but she doesn't study, cakes on makeup like crazy every day, adults tell her it's too thick, she started cussing a lot in high school after school she always goes out with friends and comes home late, it got worse when she got a boyfriend. today my mom finally snapped and yelled at her, but she talked back and got all angry, slammed the door and whined like a bitch so i went in and heard her badmouthing our mom like crazy, pathetic bitch (f*cking bitch, hope she dies early, this shit sucks) i heard all that and i'm honestly considering beating the shit out of her even though she's my sister. she used to study and clean until middle school, isn't there a way to fix her behavior?