Did I read correctly that she's 8? Wow, you must be exhausted.
How does she handle school? What do her teachers say?
How is her bedroom set up? As in, I'm wondering if you could ask her what would make her happy in there (fairy lights, that kind of thing?). Or could you maybe try moving the mattress gradually further and further from the bed?
I don't have any useful experience, but I do feel for you. It sounds like you have both been through so much, I guess it makes sense that she wants to keep close wherever possible, but from your perspective (and hers) it can't go on forever.
Maybe some co-sleepers will be able to pop in and offer suggestions for transitioning. It sounds like this is an emotional rather than habitual thing, so bribery probably is less likely to work. I wish I had some answers for you.