Sorry bro.
It's good that you can be with her to comfort and soothe her until the end.
A few months ago I held my 17 year old cat until his last breath.
Something departed him a few minutes before his final breath, it was visible and physical.
I don't believe in the flying spaghetti monster, but there is a force that departs every creature moments before the end.
Give thanks for a faithful companion & loyal friend :)