She killed 3 someones, and the 4th will probably die young anyway since people who are paralyzed do not live long after their accident. 30 years is pretty harsh considering murderers can get out in 17 pending good behavior.
Our legal systems sucks ass. If she fell asleep, went into oncoming traffic, killed 3 while severely injuring another, then 30 years is far too lenient. If the car actually went out of control (which I doubt) on its own, then 30 years would be far too harsh. If your own stupidity kills 3 others and severely injures another, then you should rot in hell, or maybe rot in jail for the rest of your life while living with the guilt.
Here's a court case and some others are cited towards the bottom: