Speak Up

I don't even know where to begin. My sister has been using meth since she was 17, she is now 31. I've tried to tell my parents for years but they've been in denial for so long. My parents finally noticed she had a problem. Meth was finally using her, she got so high that she pulled a knife on my mother, almost hit me with a mirror (while I'm pregnant) and threatened to burn down the house. My parents didn't call 911 until she started pouring fuel all over herself and our living room. It was so terrifying :( I am speaking out because I want others to know they are not alone. I also needed to let it out....we need help staying positive and finding help. She doesn't acknowledge she has a problem. Any advice would help. Thanks.