I don't think she will text you back because it sounds like she is very angry and is not being rational. I also think she is probably validating blocking you because she sees you as a bad person and wants to put the blame on you.

What I think you're trying to do is make closure so you can move on. If you really have to, you can try to send the text w/your final goodbyes but this part is important. Do NOT talk to her afterwards. If she tries to call you or text you back, leave it. If you talk to her again, and you get in another argument, it will make the pain feel worse. If you leave it after the message without expecting anything back it will make the healing process easier.

I recently lost a friend after 6 years. It was painful and I let myself cry over it for a few days. After that I spent a lot of time trying to justify why it happened and after 3ish weeks, I want some real closure. However, it doesn't happen all the time and talking to her will only make the situation worse and make her resent me even more. It's not worth rehashing the wounds over and over.

Time does heal things, you just have to be strong. ((HUG))