I am so sorry this has happened. Nothing could be harder than this. A lady on the TOS site just lost her daughter a few months ago.

I pray that you will feel a heavenly peace over you as during this tragedy.
That somehow you will have the strength and faith to go on and make a
difference in this world. And after time you will feel a comforting presence that is your little angel right there with you.
My tears are falling also and my heart hurts for you and your family as you all face the biggest challenge any person in this world will ever face.
Hope