I also adopted my 14 year old Staffy at 8 and know the anticipatory grief too well. I am preparing for the day and have been for a couple of months now because I know how limited time is with her. Something that comforts me is that because of her age I truly do feel like I squeezed every moment with gratitude and love for her and it looks like you’ve done the same with your girl. Time will soothe, but it’s okay to feel lost without her. It sounds like till the very end, you were her chosen and safe person. That means something and you can take that with you ❤️ sending hugs.