And anyway, you'd think God would know how many angels he needs to surround himself with and not have to change his mind after letting one be a child for seven years. There's no death or disease in Heaven, so it's not like one of the angels came down with laryngitis and had to drop out of the Heavenly Choir.
I can understand the need for comforting thoughts in a time of grief, but how can these fairy tales be any kind of comfort? I find it rather dismissive of the absolute horror that the child experienced. "Oh yeah she was terrified and then she got shot and maybe she bled and hurt for a little while, and maybe she saw her favorite uncle take a bullet too, but it's all okay now." Uhhh yeah, her suffering is over, but not that of her family.
When challenged about it, most people would admit that their fairy tales are just made up to soothe their feelings. People say these things without any thought for the theology of it, or even the logic of it. They make up a way to reframe their situation in a way that makes it less painful.
It reminds me of Dissociative Disorder. The abused child has been taxed beyond their ability to cope, so their mind supplies them with another personality that can take the lumps for them. We've all probably been in situations where we mentally "check out" because it's so uncomfortable. The next phase would be imagining you're watching yourself taking in the pain. After that, dissociation. And then after that.... dissociate the entire universe. Make up a universe in which the unfair becomes fair and pain is turned to comfort.
Life is tough. Death is also tough. We atheists comfort ourselves that Hitch left behind his writings and the fond memories people have of him. We had the luxury of being able to prepare for his loss, but we still miss him. The little girl's life was cut so short that there wasn't much of a legacy there. It was truly horrific, and we can empathize with the grief of her family and friends.
Thanks to vaccines, water treatment plants, sewage systems, and food safety inspections, the girl's family was not unrealistic in believing she could have lived into her eighties. But life still has its risks, however small, from day one through the "natural" ending. This is one of those times when a rare event happens. We wish they were even more rare, of course.