Do you have a therapist of your own?
I just want to clarify this question.
I mentioned in your introduction that you may have been traumatized yourself, and in this thread it seems more like it, at least to me. You were there day of, you wanted to help, and now both of you have a drastically different relationship.
Regardless of the clothing discussion, I think I'd like to reiterate that you did experience criteria A trauma according to the DMS-5:
Learning that the traumatic event(s) occurred to a close family member or close friend. In cases of actual or threatened death of a family member or friend, the event(s) must have been violent or accidental.
source:
Exhibit 1.3-4, DSM-5 Diagnostic Criteria for PTSD - Trauma-Informed Care in Behavioral Health Services - NCBI Bookshelf
And, in a moment like this, whether you were prepared to act perfectly as if you were a trained crisis counselor or not, it's not surprising that you feel so bad about this to me.
Which is why I'm wondering if you have a therapist to help you through any of this.
If it's any consolation, I've been assaulted multiple times and got different reactions from different people. Most were negative reactions. Some of those people I still love and know they didn't mean to harm me and just wanted to help. I have since worked through those feelings on my own and am no longer angry or unforgiving towards them, though the other person did have to earn my trust again, AND I had to go through the work to forgive on my own.
Point being, it's not a lost cause, even if your dynamic is different. You have a chance to form an even stronger bond now.
And, I'd like to reiterate a second point, which is that unless we go through rigorous training, we do not know how we'll react. I HAVE had moment where I reacted "perfectly" to others' trauma.
When my sister got raped last year, though, despite having a "good" reaction and being supportive afterwards, it was not only difficult to do that while I was so angry that she wouldn't agree to going to the rape crisis center, but when I initially found out, I was panicked about it. It's a lot different when it's someone close to you.
I strongly feel that the anger you were showing wasn't about your sister, even if you think it was. Feel free to correct me always, but it seems from my perspective that you were reacting to the trauma as well, and were dealing with the utter helplessness that comes with this sort of trauma.
Which could have led you to worry that it was something she had done, like wearing the wrong clothing despite your direction, or to take enough control back by soothing your own anxiety in a way (taking her to the ER)
If anything, it's possible she thinks you're ashamed of her. It's not too late, now that you've calmed down, to at least write her a note and let her know that you wish you had reacted differently, for example.
Yes, there were better ways to react, and it's terrible that it went poorly, but you are just as human as your sister. I'm sure the entire family is broken hearted about this, not least of all you and your sister.
So, do you have a therapist or do you plan on getting one? You may need one just as much as your sister does
ETA: I don't mean to say you definitely have PTSD or that your sister does -- in fact the amount of support in the moment and throughout may help to treat your traumas before it gets to that point. I'm no doctor and don't mean to appear to be diagnosing anyone, but just wanted to make sure you at least know that it WAS trauma as, as we know, we don't always know how we'll react in such situations