This story is so dreadful in how a mother could even think of leaving her severly injured daughter lying along the roadside! Let alone how long it has taken the officials to arrest the mother when a known witness was in the car with her. Why was the witness in the car not proof enough to allow LE to arrest Marcie immediately?
Other people who commit vehicular manslaughter are given very long prison sentences. Add to the circumstances of hit and run after stopping to check the scene out which was also observed by a witness, and it would seem this would add additional time to a crueless, heartless woman. Since her condition of being under the influence was not proven, she will get by with this unless LE can find witnesses , friends, who were at the event she attended willing to testify.
The old story rings true again, it's who you know in high places and how much money you have, as to how you will be treated by the law!