Wow - okay, so there's a lot going on there! From what you've written, I too would be looking to see another t for consultation. While there may be some transference there (drawing the similarities between your t's eating behaviour and your sister's issues, and what that parallel may mean), I also think there are things that would cause me to stop and question things. It's not so much her lack of emotion, rather her stating that nothing made her feel deeply unless it was really, really serious. I'd take issue with that. Where's the empathic attunement there? Also the lack of understanding around SA and your feelings about the situation. I understand she has some genuinely good qualities, but I think testing the waters with a new t might help a great deal. Good luck!