I'm not apparently doing enough to make up with my sister over a prank
Why are you not doing enough to make up with your sister?
I feel that I owe an apology.
You are a good sibling for wanting to make up, because you two are going to be together for a really long time. You need to have a good relationship, and it's not worth having bad blood over harmless pranks.
I think she needs to just get over it.
Consider your sister's feelings and muster up the courage for an apology. She might be hurt where you aren't aware, so take notice of your sister and let her know you do care about her.