You did a good job with the main character's range of emotions,

[CrispyQ]

her disbelief to grief to anger to a dull acceptance at the end. I have a few comments, though.

I see now that I misread a sentence in the first paragraph that set me up for confusion.

Swerving to avoid her as she reached under the seat to get her phone.

I read that as the boy was in the car with his girlfriend & she was driving & she swerved when she picked up her phone. So for most of the story I thought the GF was the driver. The sentence almost reads like a head hop cuz at the first of the sentence we're with the boy swerving but we end up with her reaching for her phone. It's a little confusing & an easy fix.

Also, later, when you bring up Emma Bradshaw, I thought, who is that? Part of my confusion was I thought the driver was the GF, but I still think naming Emma that late in the story is unnecessary. The woman who killed my son or something like that rings more true to the way the main character would think of her, IMO.

Thanks for sharing & keep writing!!