I am so very sorry for your loss. Bea definitely was meant to be your girl.
Three years ago on 12/20 I lost my Morgaine in a similar fashion. I left home that morning with a happy, healthy girl. By 3 that afternoon she was seizing and by 7 I had lost her. She had terrible SA and we really worked on it. She certified as a therapy dog and was amazing at it. She, too, loved kids and would let them hang all over her and love on her. I miss that big (90 ish lbs) galoot of a girl every day.
Your Bea will never fully leave you. She has made a home in your heart.
I hope that heart heals soon.