I am very sorry for your loss. Reading this thread had many tears falling, and a huge lump in my throat.
I am glad that you and Terry are at peace with the passing of Peanut. Guilt can be a horrible feeling, and you should not at all feel guilty for giving Peanut such a loving home for all these years. You did everything in your power to keep her safe and healthy. And her time was up. She missed Tubby too much.