There has been some good advice given already (and some truly TERRIBLE advice), so I'll keep this brief:
1) Your #1 objective has GOT to be ensuring your own safety. If you need to move out, stay with friends, live with relatives, whatever it takes...do it. Keeping your door locked whenever possible may be the best you can do today, but ultimately you need to put some real distance between you.
2) To be blunt: Your parents are part of the problem. Based on your story, they have been enabling her behavior for years and are in denial about the true extent of the problem now. You said that you're already done with high school -- you should give serious consideration about how you will get out of your house in the very near future and pursue your next steps (college, work, etc.) apart from them.
1) Your #1 objective has GOT to be ensuring your own safety. If you need to move out, stay with friends, live with relatives, whatever it takes...do it. Keeping your door locked whenever possible may be the best you can do today, but ultimately you need to put some real distance between you.
2) To be blunt: Your parents are part of the problem. Based on your story, they have been enabling her behavior for years and are in denial about the true extent of the problem now. You said that you're already done with high school -- you should give serious consideration about how you will get out of your house in the very near future and pursue your next steps (college, work, etc.) apart from them.
Do NOT follow this advice. "Typical" people don't threaten other people with knives.Incognito said:Sounds like the typical teenaged girl. Give her space and let her screw up on her own time. With any luck, one of the mistakes she makes will drastically alter her misguided way of thinking.