I just thought of another scenario
A horrible one
What if she jumped out and the mom drive forward a bit until she found somewhere safe to turn around. On her way back to where she jumped out she’s looking along the side of the road and accidentally hit her daughter on the curb. She would have been driving erratically while drunk and while searching the side of the road at night?? Then the mom panicked since she was drunk and didn’t want to be charged with manslaughter?
I don’t know. Maybe my imagination is too wild. I didn’t get much sleep last night