I’m sorry about what happened to your sister but it wasn’t your fault, she shouldn’t blame you and neither should you. I’m sorry things are getting worse 😞 I’m always here if you need a friend, or someone to listen

All I can say is its not your fault what happened.No one expects anything like that otherwise Im sure things would have been different.
And it sounds like shes just using you as a punching bag for her own emotions.Reflecting them onto you, trying to find a reason for what happened or something/someone to blame.To feel more in control instead of realizing that stuff like that sometimes just happens...

Ive gone rage mode on people(with permission) and even then I end up taking it out very rarely on some one.

Go easy on yourself, it's not your fault. I hope you & your sis find some peace.

Though experiences, I'm sorry your sister went through that and even she's hurting and going through that difficult situation, it's not your fault at all.. Those things happen.. you're in a very dark place if your life right, but don't compare yourself to others... Life isn't a race.. 🖤 Hope your sister and you find inner peace.