God has a plan for you and it is going to make you a better, stronger, more amazing person than you can imagine right now.
I agree, you need to get away. You will survive this. Trust your instincts always. If you think that she is a danger to you physically ...don't wait for something to happen! If you think it...and you know her well, she is your Mom...then it is too close to happening already. that is serious. When someone threatens your life...they CAN go to jail. Report it!
Make sure she has no info about your bank accounts, passwords, anything. Try to borrow a car...maybe visit a friend in another state that she does not know.
We are praying for you!!! Read the BIBLE...the answers will reveal themselves to you and guide you. Sometimes its so right on, its scary. You are never a lone.