Perhaps some crimes are big enough that there are multiple punishments. It is valuable for a society to show that some crimes will literally ruin your life, as

Perhaps some crimes are big enough that there are multiple punishments. It is valuable for a society to show that some crimes will literally ruin your life, as an example to others. Her rehabilitation will not make society whole - her best and highest calling now is to be an example of what happens when you endanger people at that scale.