You know her best and your thoughts about her are probably right.

Being sisters, she probably has harbored jealousy toward you. That’s probably the deep root of the issue. Vying for the parents attention maybe? The competition purely in her own mind?

I know you mentioned she alienated you to your parents and coerced them into giving her their money and not you getting your share. That’s pure greed. Maybe is was motivated from deep seeded jealousy, but greed is greed. She acted just like someone who got caught stealing acts.