While I agree that fleeing ought to be severly punished, nothing indicates from this story that there was anything but a speeder that took off afterward.
Around the country cities are getting hammered in these chases when they end in injury and death.
In this circumstance and from this story I can't see chasing this woman for 16 mph over the speed limit. I've run her plate, I've seen her face, lock her up later.
and if she left town with her child and killed it in a motel, you would be explaining to everyone why you didn't pursue her.