Wow. At least it was peaceful and you were there. When my grandmother passed, she slipped into a coma first, which at least gave everyone the chance to see here one last time and give her warm hugs goodbye, which probably helped a lot.
Stay strong my friend.
That's kind of what happened here. She slipped into a coma-like state, but this is expected with renal failure, which in this case was brought on by all the cancer.