Girls, do you think my punishment was too harsh or do you agree with my sister who says I deserve to serve my full punishment?

a few weeks ago I got caught shoplifting, the shopkeeper called the police and the police called my mum, as I am young the shopkeeper agreed to let me off because my mum promised the shopkeeper I would be severely punished.
my mum said my punishment was going to be as close to prison as she could make it, when I got home from school on the Friday I was escorted to my room which had been emptied of ALL entertainment, my bedroom door was then securely locked with a key it was ( HORRIBLE ) I was locked up all weekend until Monday morning for school, I had to eat in my room and was only let out for the bathroom ( PRISON ) I had to write a 4 page essay on why its wrong to steal and a 4 page essay on unacceptable behaviour and punishments, I also had to write a apology letter to the shopkeeper thanking him for letting me off,
my mum sentenced me to 3 weekends of lockdown, but 2 of them were suspended because I done my essays well and behaved while locked up, she said if I misbehave in anyway again I will have to serve the rest of my punishment, my older sister says I have got off to lightly and deserve to serve my FULL punishment what do you think?
Girls, do you think my punishment was too harsh or do you agree with my sister who says I deserve to serve my full punishment?
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