A 17 year old female, 15 at the time she killed her mother, plead guilty to second degree murder. The sentence for that is 4 to 20 years in prison. Sentencing comes later.
Let us assume the judge will be lenient, and go for the 4 years in prison. Day for day time off your sentence if you behave in the slammer means the female will do 2 years in prison for killing her mom and burning down the house.
No editorial comment needed.