Okay well when she punishes you she teaching you that there are consequences for your actions.
She always explains why she is giving you the punishment so u can know exactly what you did wrong and why you got punished.
She only does it when you do something wrong
Your mom did it to Amber any time she wanted so it was abuse even if Amber didn't do anything wrong she would still beat her so that's why it was wrong China does it because she needs to punish you for doing something wrong and she explains it then it's all out of love your mom did it out of spite just because she could so that's the difference between China and your mom.
You are a child so you're not really in a position to punish someone especially not your sister
you are supposed to love and protect your sister and teach her positive things and help her grow up punishing her is not a good way to do that because you're making her scared of you and you really make her not trust you even though she says she does it's just because she's very scared of you and that's not a good thing you're her brother you want her to feel like she can come to you and tell you anything and talk about problems and you know you should make her feel like you can help her through things