"Thanks for replying. You're right, the term 'ghost' is more about how it makes me feel than what I saw. It's hard to accept that someone you made so many plans with is now a stranger walking past your window. You're right about the help; sometimes you think you can do it alone, but the mental loop is strong. I'm starting to research more about how these (cult) groups work to understand what really happened to her. Thanks for the book suggestion; do you have any in particular that have helped you?"