The exact time doesn't matter.
It seems to me and to her family that waiting for the moment of her passing is holding us all (maybe even Paula) facing backward. Every faith or personal position describes differently what happens after this life is over, but I think--in the context of Paula's family and my own beliefs--I wouldn't be too far off in saying that we are now celebrating the new life that is to be. At any rate, God/the Universe/the Holy One/the Almighty, not we, will choose the day and the hour.
When I receive medically sound information that our bereavement is a fact, I will start a condolence thread for those of us who wish to comfort the family. Please send me a private message if you have issues with this idea.