Why is Canadian law so lenient on drivers killing others?

For those who are knowledgeable in criminal law, why is this the case?

A driver going 121km in a 60 zone, drives into girl guides, and kills an 8 year old, YET she literally gets 2 years of house arrest.

What in the fuck?

There are plenty more examples of drivers seemingly getting away with a mere slap on the wrist even though they drove like fucking assholes and killing innocent people.