My sister sack whacked me in my sleep and my Mom did not even tell her off?

I was sleeping on the lounge chair in the living room with my feet up and my sister sack whacked me while I was asleep which made me wake up abruptly and then she ran off to her room with her stupid friend. My Mom watched the whole thing from the kitchen and didn't even get angry at her? Is this some kind of favoritism?

My sister sack whacked me in my sleep and my Mom did not even tell her off?
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