What's the Name of That Book??? discussion

I read this book around ten years ago. It was a slightly dark children’s/ya book involving a girl who dies when her family gets into a car accident. Something about her particular way of death results in her not being able to pass on to the real afterlife, so she is stuck in an in between life in a “parallel” reality with other kids throughout time who have died similarly to her.

I remember there were people who would flock together and form kinda gangs to stay safe together. Also the ground was squishy like quicksand since this dimension was only kinda there. The only places with solid ground were places where a ton of people had died or something. I just remember the main character walking around with essentially snow shoes on so she would not be sucked to through the dimension.

Everlost by Neal Shusterman?

That’s it! I had no idea it was by Neal Shusterman!!