I have a blind horse, but he wasn't blind when I got him (chronic uvitus*, nothing we could do to save his vision). He's very fearful of everything.. Since he can't see.
I think that's how your mini is feeling. Be very calm, don't get mad at her. She's scared. Don't force her to lead. Get her used to you, have her trust you. Desensitize. Have someone hold her while you touch all over her body. Use calming words, and especially touch around her around her legs/hooves. Work in short sessions throughout the day. Treat her like a foal; a sponge. A sponge who doesn't know anything but to be a horse. A sponge that gets bored, frustrated, or scared, just as you would.
I hope you both can work though this!