I just ended a toxic life long friendship after she made my divorce all about her and attacked me in a one-sided text fight where she told me horrid things about myself that aren’t true.

I didn’t engage with her because she is a person who always has to get the last word.

I think you summarized the whole toxic situation perfectly and know you need to rid yourself of her. I’d suggest simply being too busy to ever talk to her or see her again. When she gets angry about your distance, which she will, let her have her one-sided text rant, then tell her she’s too toxic and block her on everything.