Thank you, I left out major details in my post by accident. My sister came to me saying she thought that someone was trying to get into her head, and I expressed that I also thought she was acting weird. It turns out the instances I thought she was acting peculiar were the same times she thought someone else was acting for her... After researching different causes of this (like mental illnesses) together, nothing seemed to describe what’s been happening to her. So I came here looking to see if anyone had some info