When I say 'pulling back' I do not mean going no-contact, I mean being completely ambivalent about your future together and not making any attempt to fix anything.
See if you can have a conversation without you bringing up the relationship at all, just talk about other stuff. Is she still keen to talk to you? Is she distant or guarded? Does she start talking indirectly about the relationship without you prompting? Is there anything she wants to get off her chest? Can you make her laugh?
If there is anything left of her desire to be with you, she will feel it most strongly when you are just enjoying the moment together, without any pressure. But you will have to be able to release all your expectations and enjoy vibing with her as if it is all you want or need from her.
But any hint of neediness or agenda and it'll all be for nought. If there is any avenue for the relationship to continue, it will have to be her choice and by her invitation, as a result of her wanting to continue those moments. If you can't do that, then I'd suggest moving on completely and focusing on your own future.
I think it is best if you mentally accept that it's over, and treat it as if all you want to do is leave good feelings and memories before she goes, as someone you cherished. That may be what it ends up being, but you'll have given her the opportunity to experience the best of you again, and decide for herself what she wants.
" - she isn't even declining outright...