My best friend got into a car crash and doesn't remember me. I don't know what to do.

Oh no! I'm so sorry. Maybe try to get her to remember you by telling her things that you did together that stuck with you, some of your favorite moments together. But is that doesn't work, I think that the only thing you can do is start over with each other, at least then you can still be friends. Introduce yourself to her and, even though it will take some work, if you became best friends once, it can happen again.

Explanation:

Again, I am so sorry that you have to go through this, please though try to mend things with her, even if that means starting completely over.