I don't want to see my liar/methhead sister
Is there a reason that you are avoiding her?
I just don't want her to take advantage of me.
When a family member is hooked on drugs they can be toxic. It's good to cut away from them until they get the help they need.
No one asked for your advice deus. I will cut her out when I close my eyes and imagine her in hell.
I do not really think that you are wrong in this case. You should cut ties with family members that you feel are this toxic to your well being.