I understand how it hurts remembering something you don't want to remember, especially it's a dear person to you who's gone now
Whenever you remember just hope she's doing good in heaven, I'm sure she's in heaven and having a good time there :)
Maybe knowing your sister might be in heaven is a relief that she's in a better place
Someday you'll see her when it's time for you and hopefully you two will meet have so much fun together in heaven!
I'm glad you've been recovering from it, you're so strong handling this feeling!