My Best Friend does not want to be Friends anymore. Did I do my best?

Hi, I recently got into a bad fight with my best friend. We have been very close for seven years. She said that she didn't want to drop me and end everything, but she unfollowed me on every social media platform and is acting cold to me. I would be fine if she said she wanted to talk less, but she told me that I was only an acquaintance now. I'm hurt and confused.

I recently reached out to try to talk things out with her again -- at least to remove any bad feelings between us. She said that we could talk, but that she had said everything that she had wanted to say to me. She also got nervous and physically sick the last time we talked, and she said she felt like that would happen again. I realized that I was the only one who had things left to say to her, and I didn't want to make her sick again. I decided not to say anything more. It broke my heart.

I keep holding onto this hope that she'll come back. I've talked to others who said that I did my best, and that it isn't all my fault. I've apologized and am trying to fix the things she said I did wrong. Did I really do my best? Do you think anything I say will change her mind? It's just hard to imagine she would do this. I've known her for so long and this isn't like her... Thank you for your replies...