What beautiful cat, I love black cats and lost mine a couple of years ago, the house was so quiet for a while, such a big presence missed. I got the sense that your beautiful cat is happy and purring away in the sunshiny warmth in spirit, She has such magnificent eyes that I bet got her into lots of fun and trouble, and you must miss her tremendously.
I used to work with animals and spent a lot of time with them. I believe that they show they are ok by giving us little signs. Shadows and sounds around the house as if they are still there but just hidden from view.