Your sister doesn't sound like a narcissist to me, although your parents do as far as the whole golden child and scapegoat child thing goes.

Your sister sounds like she is either paranoid to the point of psychosis (delusion), or like she is a full-blown sociopath. One or the other.

She should have been legally charged for stealing your vehicle.
She should have been legally charged for falsely claiming to the police that you murdered someone.

Things like this are grounds for legal action, which frankly you should be taking when they occur.

Narcissists are no fun, but this sort of behavior is not standard for them. They tend to be high-functioning in terms of not getting in trouble with law enforcement, if all they have is NPD.

Your sister needs help if she is suffering from psychosis and extreme reckless behavior like stealing someone's vehicle.

Or she needs to be charged for committing crimes if she is refusing help and seems to be able to function very well (college, job, etc) which would indicate more of an AsPD thing.

In either case you should be reporting your concerns to the police when that sort of thing happens.

Narcissists are obnoxious due to their sheer level of denial and their manipulation ********, and can be mentally/emotionally abusive if you stick around them, but the behaviors you describe go beyond NPD. Your sister could be dangerous to herself and/or others.