It's very hard and having dealt with this same thing with my students it's not going to be easy for them to understand that he was at fault for his death. All they see is someone hit him, punish them. They won't see that he was in black, on a dark road, walking where and when he shouldn't have been. The most negligent party here is him, and then his parents for letting him be out that late.
We had a young man walking in black, with traffic, around 1am, and wearing headphones. He never looked behind him, he turned and walked straight into the path of a pickup truck. The driver of the truck has since committed suicide because even though he couldn't have prevented it, he blamed himself, the community made him feel horrible, the kids vandalized his home and truck, threatened his family, he got death threats on the phone and in the mail, and then when he killed himself everyone pointed and said See? He was guilty or he wouldn't killed himself!
The race card will always be played, unfortunately our world is segregated worse than ever. When you have the Black Chamber of Commerce, the Hispanic Chamber of Commerce, and other racially dividing entities it will always be this way. Unfortunately if an Anglo person is driving it doesn't matter who jumped in front of the vehicle, they will want the driver's blood because of the racial divide.
It is going to be very hard on your daughter, I'm so sorry for that. It's something she will remember her entire life and if it has her telling her future children to dress brightly and stay off dark roads, something good will have come of it. There is nothing we as parents can do but hold them until it passes enough that you can talk about him and remember him, and let her know that it is ok to grieve, that it's ok to cry, and it's ok to remember him every single day,, but it is also ok to let him go.