Aggressive behaviour

Hey, im new to this forum. My little sister (who is 9) has autism and has behaved well until recently. She's always had this terrible habit of biting her hand but now she is taking it to the extremes by causing herself to bleed, slapping herself really hard etc... She has also began attacking other people by hitting, pinching and even biting them relentlessly. My parents have bruises all over their arms and legs, especially my mom. Just today my little sister also ripped my mom's ear off by pulling at her earring. It's getting worse everyday and I've done research but i don't know what to do and neither do my parents. Does anyone know what i could do or if there are any services to help with her aggressive behaviour?