idk what id do if my sister did that..
Well, if that happens, you can:
1) Tell your mom (remember to record the evidence as early as you can because my sister archived her post to hide the evidence).
2) Accept it and do what you can to improve.
Anyway, don’t lose trust in any of your siblings just because of my post. I’m sure that if you have a sibling, then he/she would never do that.
Honestly your sister sounds like she was so dumb to do that. Like why??