How do I undo asking a friend to be my Maid of Honor?

What you really need is a clean break. She is not a friend in any sense of the word, and she cowed you and bullied you into apologizing for no reason at all, you did nothing wrong, you are not living your life for her, you are living your own life and everyone's life comes with it's own set of problems and she had no right to go off on you like that; did she call you up when your life was upside down? No. So she is a bully and selfish and obnoxious and haring and you need to just call of the alleged friendship and tell her right up front you cannot have ANYONE in your life or your wedding that upsets you like that, you do not want need nor will you accept her drama, then tell her not to contact you again and hang up. You don't have to yell, your words will be plenty but write everything down and call her so she doesn't get you off track, just say what you have to say even if it means talking over her when she interrupts you and call it a day, you do not need this wacko in your life at all.