As someone whose "best friend" ghosted me, I would love her to reach out and tell me she wants to be back in my life. I'm sure Zelda would too. Reach out. Tell her you're sorry. Maybe it will rekindle the friendship. Maybe it will make her feel better and give her closure.
Just do it. You don't have to be perfect. Reach out. Nothing you do will make it worse than where you're currently at. And the positives could be amazing.