River Daughter Blog Whats This Book? Teen Book About Family That Goes On A Picnic Near A River And The Daughter "dies"?

Whats this book? teen book about family that goes on a picnic near a river and the daughter "dies"? - river daughter blog

They thought they died because she was coloring book on the dock, but then the son rewatched watch the video and saw the ice cream truck in the distance the lights and the things and experiences that they were taken. and people were like ice and Mel bill or something, and they were friends of the family. Does anybody know what this book?