Hi Cassandra,
Please accept my comments with the love with which they are intended.
I think what you are looking for does exist, it exists in your mind in the form of memories, and very fond ones. Memories of happy times and places that do not quite exist physically any longer, at least not quite as you remember them, but they will live forever in your mind.
If you reread your original post, I think you already know that, but just would like to hear it from someone other than yourself for a little reassurance. So follow your heart, give yourself time to grieve, and take care of your kitty.
I think you've got this.
I wish you peace.